Nagios, one of the most popular tools for network monitoring, comes with its own share of problems as well.
One of the most prominent problems is that it is difficult to setup and maintain as all configurations should be done only through config files.
This can be cumbersome and time-consuming.
Also, many IT administrators prefer to work with a Windows-style GUI instead of Linux and Unix commands, and this is a spot of bother in Nagios.
Other problems include its Auto-discovery of applications and services, complicated management and more.
Due to these aspects, it is good to know your alternative options, especially if your IT admin team prefers it.
Here are the Top Alternatives to Nagios
Though Nagios is one network monitoring tool, there are many others tools that could give Nagios a run for its money.
In this guide, we will look at some of the alternatives for Nagios but if you’re using Linux you might want to skip straight to the best Linux Monitoring Software.
1. SolarWinds Network Performance Monitor – FREE TRIAL
SolarWinds Network Performance Monitor is a powerful tool for network monitoring, as it helps to quickly detect, diagnose and fix any network-related problems and outages.
The important features of SolarWinds Network performance Monitor is listed below.
- Comes with Advanced Fault monitoring to quickly identify problems, understand their root cause and fix them at the earliest.
- It can monitor the performance and availability of devices that are on-premises, in the cloud or in a hybrid environment.
- You can drag and drop different performance metrics on a timeline, to identify the root cause at the earliest.
- It can provide intelligence-based alerts, as it takes into account several parameters such as topology, dependencies and performance.
- Automatically discovers and maps devices in the network topology.
- Allows you to customize thresholds, according to peak and bandwidth usage.
- It monitors the performance and availability of F5 BIG-IP family of products.
- It can monitor performance points for clients, wireless controllers and autonomous access points.
- It can be installed and deployed within just an hour. The setup and use are well-documented and is fairly intuitive as well.
- You can automate capacity planning with this tool.
- Comes with web-based performance charts, views and dashboards, so you can stay on top of your network’s performance from anywhere.
- Helps you identify if changes in end-user experience is caused by the network or application.
- Calculates baseline thresholds from historical performance data.
- It monitors many key metrics of hardware components such as temperature, fan speed and power supply.
- Comes with more than 100 templates for reporting.
- You can create interactive charts and graphs to get a better understanding of your devices’ performance.
You need the following system requirements to install SolarWinds Network Performance Manager.
- .NET Framework: Version 4.5
- Operating system: Windows Server 2008 R2 SP1, Windows Server 2012 and Windows Server 2012 R2.
- Hard drive: 20GB free disk space
- Memory: 3GB
- CPU: Dual processor, 3.0 GHz
- Databases Supported:
- SQL Server 2008, 2008 SP1, 2008 SP2, 2008 SP3 and 2008 SP4
- SQL Server 2008, R2 SP1 and R2 SP2
- SQL Server 2012, 2012 SP1, 2012 SP2 and 2012 SP3
- SQL Server 2012, 2014 SP1
- SQL Server 2016
Price: 30-day Free Trial Download!
2. Paessler PRTG Network Monitor by Paessler – FREE TRIAL
Paessler PRTG Network Monitor by Paessler is a powerful solution that analyzes your entire infrastructure to give you a comprehensive idea of the weak points and the performance of devices in your network.
Some of the salient features of PRTG Network Monitor are as follows.
- Provides aggregated statistics of many parameters such as status, availability, CPU load and bandwidth to get a quick overview of the status of your network.
- Packet sniffing examines every single packet of data passing through your network to understand the possible problems that is increasing your bandwidth.
- Supports NetFlow, sFlow and jFlow
- Monitoring is done by sensors, that are arranged in a tree-like hierarchy to make navigation easy.
- It sends alarms and unusual alerts, based on the threshold values you have set. Red signifies alarms, yellow markings are warnings and orange is used to depict when there is an unusual reading from any device.
- It scans your network and auto-discovers sensors and devices. It even maps all of it for you.
- Comes with many templates for reports. A unique template is the “Top 10 Lists”, where it lists devices that fall into different categories such as best and worst performance, fastest and slowest performance, highest and lowest bandwidth use, highest and lowest CPU load and more.
- Reports are comprehensive and can be used to analyze historic results over a specific day, month or year.
- Reports can be run on-demand or they can be scheduled, and a report can be created for one or more sensors. This way, you have complete control over what you want to see and when you want it.
- Allows you to do a long-term comparison of the performance of your applications using remote probes.
- Its “maps” feature allows you to create web pages with monitoring information, in a customizable layout. This feature opens up countless possibilities to stay on top of your network.
- It can be scaled for networks of any size. Whether you want to use 100 or 10,000 sensors, this tool will work for you.
- Comes with 10 built-in technologies for sending alerts and they include email, push, play alarm audio files, trigger HTTP requests and more.
- Comes with a full-featured AJAX based web interface.
- Also, offers a Windows native Enterprise Console to see the performance of different devices.
- Has apps for both Android and iOS
- All user interfaces are SSL-based, and local and remote access can be done simultaneously.
- Allows failover tolerant monitoring, which means, one single failover is included in every PRTG license. Also, failover handling happens automatically and doesn’t require your intervention.
- It can monitor many network spread across different locations, provided they are all a part of your organization.
- Remote probes can be used to distribute monitoring loads.
- You can export your data in many file formats such as PDF, XML, HTML and CSV.
- Supports many languages such as English, German, Spanish, French, Dutch, Russian, Japanese and Simplified Chinese.
The system requirements depend on the number of sensors installed.
Number of sensors
|Up to 1,000 sensors||2 CPU cores||3 GB RAM||250 GB||Less than 30|
|1,000 to 2,500 sensors||3 CPU Cores||5 GB RAM||500 GB||Less than 30|
|2500 to 5000 sensors||5 CPU Cores||8 GB RAM||1 TB||Less than 20|
|5000 to 10,000 sensors||8 CPU Cores||16 GB RAM||2 TB||Less than 10|
Price: The cost depends on the number of sensors you want to use. Here is a breakup of the cost, based on sensors.
- 100 sensors – free
- 500 sensors – $1,600
- 1000 sensors – $2,850
- 2500 sensors – $5,950
- 5000 sensors – $10,500
Besides these plans, PRTG also offers two plans called XL1 Unlimited and XL5 Unlimited. In XL1 Unlimited, you can install any number of sensors on one core installation while in XL5 Unlimited, you can install any number of sensors on five core installations. You can start with a 30-day free trial.
3. ManageEngine OpManager
ManageEngine OpManager is a powerful and user-friendly network monitoring software that efficiently monitors even the most complex of networks.
The features of OpManager are:
- Monitors routers, WAN links, interfaces, bandwidth and more.
- Monitors VoIP call quality throughout the WAN infrastructure. It can even troubleshoot low quality VoIP problems.
- Visualizes and resolves WAN or router problems.
- Maps the entire network to identify outages and performance issues.
- Always monitors WAN availability, latency and performance using Cisco IP SLA technology
- Monitors both physical and virtual servers running different operating systems like Windows, Linux, Unix, Solaris, VMware and more.
- Uses 70 different VMware monitors to monitor VMware devices.
- Uses WMI credentials to monitor Microsoft Hyper-V hosts.
- Monitors and manages the storage repositories of Citrix XenServer.
- Monitors processes that run on SNMP/WMI and CLI.
- Uses different protocols such as SNMP, WMI and CLI to monitor resources and gather performance data.
- Helps to automate first-level troubleshooting steps.
- Comes with a rule-based trap processing engine that can handle more than 300 SNMP traps per second.
- Centralizes event log monitoring to monitor all critical security logs.
- Makes it easy for you to analyze systems trends and performance with its customized reports and templates.
- Gives deep insights into the performance and configuration of RAID devices.
- Monitors tap libraries to detect fault conditions and generate alarms.
- Analyzes historic as well as current usage trends.
- Automatically discovers fabric switches in your SAN environment.
- Scales to accommodate up to 10,000 devices and ensure high availability of the same.
- There is robust communication between the central and probe servers deployed in remote sites.
- You can get the log data generated by firewalls to get crucial information related to the security of your network.
- You can schedule configuration backups whenever required.
- Helps with switch port and IP address management.
Price: 30 Day Free Trial!
Zabbix is an enterprise-class monitoring system that is designed for monitoring different devices on a network.
Some important features of Zabbix are:
- Collects metrics from any device, system or applications.
- A native Zabbix agent, created using C language, runs on Unix, Linux and Windows to collect information such as CPU, memory and CPU interface.
- It can collect data from devices with SNMP agent versions v1, v2 or v3 as well as printers, NAS and UPS. In fact, it can collect data from any device that can be monitored through SNMP agents.
- Zabbix also supports IPMI agents to get important information from hardware.
- You can also create custom agent checks.
- Custom scripts written in any language such as Perl, Python and Ruby help to extend the functionality of this tool.
- Offers predictive functions that analyze incoming data to predict problems, so you can get to them proactively.
- You can retrieve and manage historical and configuration data.
- It also provides flexible and intelligent threshold definition options to minimize false positives and to focus on the main issues.
- A trigger expression can be created with data obtained from different devices.
- Offers historical data analysis
- Takes into account the dependencies before sending out an alert.
- You can integrate Zabbix with third party software.
- Sends notifications through many channels. You can even configure the channel for each kind of notification. For example, you can program the system to send you alerts through SMS if the criticality level is severe and through email, if its moderate.
- Comes with a native web interface that makes it easy to access information from anywhere/
- You can create any report with this tool.
- This web interface is the single point for configuration and for viewing all reports.
- It supports Unicode / UTF-8 for a local flavor.
- Works well on most modern browsers like Chrome, Firefox, Safari, Internet Explorer, Konqueror and Opera.
- You can do a global search at any time.
- The interface comes with a host of themes, so you can customize it to match your preferences.
- There is strong encryption between all Zabbix components.
- Uses multiple authentication methods such as LDAP and Active Directory.
- Code is open for security audits.
- Installation is easy and can be done within minutes.
- Configuration templates help to monitor thousands of devices on your network.
- The Zabbix community has built hundreds of templates as well.
- You can also build custom templates too.
- Scans your network periodically to discover new devices and updates the topology map accordingly.
- Automatically starts monitoring new equipment, once they are discovered.
- Monitors behind firewall DMZ.
- Allows you to run scripts remotely on monitored hosts.
- Collects data even when there are network issues.
- Zabbix management can be done through APIs.
- You can create new applications to work in Zabbix.
Zabbix works well on the following platforms.
|Mac OS X||Yes||Yes||Yes|
Price: It is open source and free to use.
Download: You can download Zabbix from https://www.zabbix.com/download
We’ve also written a post about the best Zabbix Alternatives.
Icinga is an open source network monitoring application that was originally created as a fork of the Nagios monitoring system. It was started to correct the shortcomings of the Nagios monitor and to add new features. It takes its name from a Zulu word that means examines, browses or looks for.
- Scales up to thousands of nodes in a quick and reliable way.
- Its reporting module comes with an improved SLA, database connectors for PostgreSQL and distributed systems to ensure redundant monitoring.
- Monitors network services, host services and server components.
- Does parallel service checks
- Comes with a simple plug-in design, so you can easily develop your own service checks.
- You can define network host hierarchy, so there is a distinction between hosts that are way down and unreachable.
- Allows you to run define handlers for proactive resolution of problems.
- Alerts can escalated to other users or to other communication channels.
- There are many channels through which notifications can be sent.
- Comes with two optional web interfaces – Icinga Classic UI and Icinga Web.
- The reporting module is based on the open source Jasper Reports.
- There are many reporting templates including those for capacity planning.
- It has a multithreaded design, so thousands of checks can be run simultaneously.
- It’s distributed setup makes Icinga ideal for large and complex environments.
- Rules can be applied to hosts and services to create a continuous monitoring environment.
- RESTful API makes it easy to update your configurations or show the details you want, on-the-fly.
- Supports Graphite and InfluxDB natively.
- You can get better insight about the performance of your devices with Icinga’s metadata.
Price: It is open source and free to use.
Download: You can download Icinga from https://www.icinga.com/download/
OpenNMS is an open-source enterprise grade network monitoring tool developed by the users and community of OpenNMS.
The features of OpenNMS include,
- It is based on an event-driven architecture that allows flexible workflow integration.
- It normalizes device and vendor specific messages and protocol specific performance metrics, so everyone can understand.
- The data can be accessed through RESTful API.
- Sends notifications through multiple channels such as emails, Slack, MatterMost, Jabber and even sends microblog notifications like Twitter.
- You can run external scripts to customize the notifications.
- Allows you to integrate with existing ticketing tools or with your own ticketing system.
- Alarms can be forwarded to applications too, so they can be integrated into your management workflow.
- Comes with a synthetic polling framework to test anything from IP stack to applications.
- It can test generic TCP connection, status and resources from management agents, measurements from open protocol and management agents, SNMP traps and syslog messages.
- Database schema is controlled with Liquibase, so updates and maintenance are a breeze.
Price: OpenNMS comes in two editions – Meridian and Horizon. Horizon is FREE, but Meridian comes with a yearly subscription.
Here are the differences between the two editions.
|Environment:||Ideal for businesses looking for stable environment with good support||Ideal for monitoring new technologies and IT ecosystems like virtual machines and Docker.|
|Development model:||Open source||Open source|
|License:||AGPLv3 or proprietary license||AGPLv3|
|Release cycle:||Once every 12 months||3 to 4 months|
|Support:||Multiple options available||Community supported mailing lists and wiki|
|Maintenance:||Access to update server for latest releases or bug fixes||Community driven|
|Configuration:||Supports preconfigured events, workflows, reports, data collection and notices.||Configured and maintained by users and community.|
|Cost:||Yearly subscription for every management server||Free|
|Features:||Comes with features that support stability, usefulness and quality of integration with existing code.||Mainly explores new technologies to drive advances in management technologies.|
Contact the support team for the cost of Meridian.
To conclude, there are many good alternatives for Nagios, and we hope the above options help you to make the right choices. We suggest you download one of the aforementioned software suites from above and give it a test in your environment.
Each of the software packages above have a different strength, weakness and price-point as well. Check out their features above and give several of them a try, you’ll quickly know which one will serve you best – From our Experience, SolarWinds has a great Nagios Script Import feature that allows you to import scripts and eventually migrate them over. Give them a try if you want a fast solution.
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What is alternative to Nagios? ›
Zabbix is an open source monitoring tool. This network monitoring tool focuses on monitoring and trending functionality. This software is widely used for monitoring servers and network hardware. It is one of the best open source Nagios alternatives which can forecast future behavior based on historical data.Is Prometheus better than Nagios? ›
Prometheus is useful for monitoring app functionality, while Nagios is a very powerful platform for application networks and security. However, Prometheus has the edge in performance metrics.Which is the most common tool used for network monitoring? ›
SNMP: The Simple Network Management Protocol, a.k.a. SNMP, is one of the most common network monitoring protocols. SNMP can be used for polling (a monitoring station queries a network device) and notifications (a device sends an SNMP TRAP or INFORM to a monitoring station).Which is better Nagios vs Zabbix? ›
Zabbix is a complete, open-source, and enterprise-level monitoring software. While Nagios is designed to monitor your IT infrastructure, Zabbix is a large-scale distributed monitoring tool that is capable of monitoring any and every platform and device.Is Nagios outdated? ›
These days, most software vendors focus on reducing IT complexity and minimizing the workload for users. IT monitoring should not be an exception. By now, the code base and the architecture of Nagios are outdated and no longer state-of-the-art.What is difference between Nagios and Cacti? ›
Nagios supports Netflow, while Cacti does not. Cacti can be integrated with Datadog and RRDtool. On the other hand, Nagios can be integrated with a number of tools such as Datadog, PagerDuty, Zulip, and PagerDuty, among many others.What is the difference between Nagios and Grafana? ›
Grafana can integrate with a huge range of collectors, agents, and storage engines. Grafana is open source, and free. Nagios is a legacy IT infrastructure monitoring tool with a focus on server, network, and application monitoring.What is Prometheus not good for? ›
Prometheus isn't intended for durable long-term storage. You can use an observability platform or another storage source for long-term storage. For instance, New Relic provides extended storage for up to 13 months for dimensional metrics.What is the difference between Nagios and Solarwinds? ›
VM HyperVisor Monitoring:
Solarwinds requires the Virtualization Manager program to monitor different types of hypervisors. Nagios is natively able to monitor VMWare and VMWare alone.
- Install a packet sniffer like Wireshark on your computer. ...
- Use NetFlow or sflow data from your routers and switches. ...
- Use the built-in tools in your operating system to monitor network traffic. ...
- Use third-party software to monitor network traffic.
What are two monitoring tools that capture network? ›
- SolarWinds® NetFlow Traffic Analyzer (Free Trial)
- SolarWinds Network Performance Monitor (Free Trial)
- SolarWinds Bandwidth Analyzer Pack (Free Trial)
- Paessler PRTG Network Monitor.
- ManageEngine NetFlow Analyzer.
Having been developed years after the initial development of Nagios, Icinga is completely object oriented. The web user interface of Icinga is considered to be more intuitive than the interfaces of Nagios Core, although the enterprise version of Nagios has a well developed user interface.Is Zabbix a Russian company? ›
ZABBIX SIA is based in Riga, Latvia. Its CEO is Alexei Vladishev, the owner and ZABBIX product manager. business demands including implementation, integration, custom development and consulting services as well as various training programs.Is Nagios and Icinga the same? ›
Difference Between Icinga vs Nagios. Nagios and Icinga are the monitoring tools used to track the performance of the system. The Icinga was in the market for around 10 years and served the user with great features, whereas Nagios is a widely established product with a broad community and has more add-ons.What is the new version of Nagios? ›
Your installation of Nagios Core 4.1. 1 is outdated and should be upgraded. The latest version of Nagios Core is 4.4. 10 was released on 2023-01-17.Is Splunk and Nagios same? ›
While Splunk is used for log analysis Nagios is used for continuous monitoring. Both Splunk and Nagios are the tools to study the health of system infrastructure. While each has a distinct way of working and different architecture, there are some areas where they overlap.What is the difference between Nagios and Checkmk? ›
Nagios is a host/service/network monitoring program written in C and released under the GNU General Public License; Checkmk: A tool for Infrastructure & Application Monitoring. It is a software developed for IT Infrastructure monitoring.Is Nagios no longer free? ›
|Original author(s)||Ethan Galstad and others|
Nagios helps us to monitor health of our network, server, switches - any component which makes up our infrastructure. Not only does it monitor and alert, it can also fix issues based on the configuration setup.Does Nagios use Python? ›
nagiosplugin runs on POSIX and Windows systems. It is compatible with Python 2.7, and Python 3.4 through 3.7.
What are the disadvantages of Grafana? ›
- Limitations on dashboard organization and design. Visualization panels are limited to those made available by Grafana Labs and its community. ...
- No data collection and storage. ...
- Limited data type visualizations.
- Instana, an IBM Company.
- Splunk Infrastructure Monitoring.
- Sumo Logic.
Both Splunk and Grafana provide robust capabilities, but Splunk provides more advanced alert management and tracking, while Grafana provides more granular control over alerting rules at the panel level.Is Prometheus better than Zabbix? ›
Zabbix and Prometheus are both excellent platforms but have different strengths. Prometheus is easier to set up, and it is better at data collection due to its powerful query language (PromQL). It also has a significantly larger community where you'll be able to get support while configuring it to meet your needs.What are the limitations of Prometheus? ›
A Prometheus with millions of metrics can use more than 100GB of RAM, and that can be an issue running in Kubernetes. You must scale out to absorb capacity, but the short answer is that you can't. Prometheus is not designed to be scaled horizontally. Once you hit the limit of vertical scaling, you're done.What is Prometheus vs Grafana? ›
Prometheus collects rich metrics and provides a powerful querying language; Grafana transforms metrics into meaningful visualizations. Both are compatible with many, if not most, data source types. In fact, it is very common for DevOps teams to run Grafana on top of Prometheus.Who is SolarWinds biggest competitor? ›
- New Relic.
- Amazon Web Services (AWS)
SolarWinds NPM is the #4 ranked solution in top Cloud Monitoring Software, #5 ranked solution in best Network Monitoring Tools, and #5 ranked solution in Infrastructure Monitoring tools. PeerSpot users give SolarWinds NPM an average rating of 8.0 out of 10.Is Nagios a SIEM? ›
A powerful trio of Nagios solutions
Within a SIEM system, you're counting on software products and solutions to combine security information management and security event management.
- Open the Google Home app .
- Tap Wi-Fi .
- At the top, tap Devices.
- Tap a specific device and a tab to find additional details. Speed: Real time usage is how much data your device is currently using.
How do I track everything on my network? ›
Using a router, open browser and enter router IP address > Enter > locate Device List > Status, or Bandwidth or Network Monitoring.Can Wireshark monitor all network traffic? ›
By default, Wireshark only captures packets going to and from the computer where it runs. By checking the box to run Wireshark in promiscuous mode in the capture settings, you can capture most of the traffic on the LAN.What are the 2 methods that a network manager uses to monitor traffic? ›
- Ping monitoring. Network pings are one of the oldest monitoring techniques, but it is still widely used by NPMs today. ...
- Log file monitoring. ...
- SNMP monitoring. ...
- NetFlow monitoring. ...
- SQL query monitoring.
- Firewalls control incoming and outgoing traffic on networks, with predetermined security rules. ...
- Network segmentation defines boundaries between network segments where assets within the group have a common function, risk or role within an organization. ...
- Zero Trust.
These operational areas are fault management, configuration management, accounting management, performance management and security management, also known as FCAPS.What's a good system monitoring tool? ›
Our top recommendations include SolarWinds Server and Application Monitor, eG Innovations, Datadog, NinjaRMM, Site24x7, Sematext, Atera, and PRTG. If you have a sophisticated infrastructure with loads of devices connected, then you must opt for tools like SolarWinds, PRTG, OpenNMS, Nagios, and Icinga.What are the two main types of monitoring? ›
- Results monitoring which tracks whether a project is on target towards its intended results (outputs, outcomes, impact) e.g., Have all the children in a target community actually been immunised?
- Process (activity) monitoring tracks whether inputs and resources have been used efficiently.
Few tools are as useful to the IT professional as Wireshark, the go-to network packet capture tool. Wireshark will help you capture network packets and display them at a granular level. Once these packets are broken down, you can use them for real-time or offline analysis.What is Icinga monitoring? ›
Icinga is a monitoring system which checks the availability of your network resources, notifies users of outages, and generates performance data for reporting. Scalable and extensible, Icinga can monitor large, complex environments across multiple locations.Is Icinga based on Nagios? ›
Icinga is an open-source computer system and network monitoring application. It was originally created as a fork of the Nagios system monitoring application in 2009.
Is Icinga free or paid? ›
Free. We give you the ultimate control over the software with our free and open source products.What is better than Zabbix? ›
We have compiled a list of solutions that reviewers voted as the best overall alternatives and competitors to Zabbix, including Datadog, checkmk, PRTG Network Monitor, and Dynatrace.Can Zabbix monitor network? ›
Zabbix is an open source monitoring software tool for diverse IT components, including networks, servers, virtual machines (VMs) and cloud services. Zabbix provides monitoring metrics, such as network utilization, CPU load and disk space consumption.Who owns Zabbix? ›
The Zabbix company was established in 2005 when its CEO and owner, Alexei Vladishev, made a game-changing decision to develop further the monitoring solution he worked on.Which is better Nagios or Prometheus? ›
Nagios monitors the servers, networks, and applications, while Prometheus is not good at these activities. Server monitoring helps to find the logged data, and if there are any errors, this monitoring helps to solve them. The disadvantage of using alerts in Prometheus is that it will not work without alerts.Is there a free version of Nagios? ›
Download Nagios - Nagios Core is free.What is the new Nagios? ›
Your installation of Nagios Core 4.1. 1 is outdated and should be upgraded. The latest version of Nagios Core is 4.4. 10 was released on 2023-01-17.Is Splunk a network monitoring tool? ›
Network Monitoring: A Beginner's Guide | Splunk. Transform your business in the cloud with Splunk. Build resilience to meet today's unpredictable business challenges. Deliver the innovative and seamless experiences your customers expect.Can Splunk be used for monitoring? ›
Splunk is used for monitoring and searching through big data. It indexes and correlates information in a container that makes it searchable, and makes it possible to generate alerts, reports and visualizations.What are the cons of Icinga? ›
We have found some problems with Nagios, and support isn't very responsive. The installation and configuration are very complex. In general, the product does not look good. However, it does what it is supposed to do.
What is Icinga used for? ›
Icinga is a monitoring system which checks the availability of your network resources, notifies users of outages, and generates performance data for reporting. Scalable and extensible, Icinga can monitor large, complex environments across multiple locations.What is Nagios free limitations? ›
The main disadvantage to using Nagios XI free is that you are limited to 7 total nodes, or hosts. You can monitor more than you may think with 7 hosts though. A host is typically anything with an IP address. Under that, you can monitor unlimited services attached to that host.Is Zabbix free to use? ›
Zabbix is released under the GPL license, thus is free for commercial and non-commercial use. There are no limitations on the number of monitored devices, you can use Zabbix to monitor many thousands of devices absolutely free.
Nagios XI does not have limitations, offers such as AppOptics impose on the customers (making it very expensive and absolutely not a real life product).