The Top 17 Free and Open Source Network Monitoring Tools

The Top 17 Free and Open Source Network Monitoring Tools

Choosing the right network monitoring solution for your enterprise is not easy. IT professionals and decision-makers need to consider several factors when choosing solutions for their business, such as security, compatibility, ease of use, and (of course) budget. Enterprise-grade tech solutions are typically viewed as expensive, but is that always the case? Not necessarily! There are several free and open source network monitoring tools that your business should consider when choosing a network monitoring solution.

That’s why we at Solutions Review have compiled a list of the best 17 free and open source network monitoring tools. These tools are either free to install and use, or released under an open source license. They should definitely be considered if your enterprise wants to keep costs down, but we should note that they may not be the best fit for your company. Many free tools are trimmed-down versions of a fully-equipped network monitoring program, and a lot of open source developments require technical knowledge or developer expertise. As such, we’ve listed some of the major features of each free and open source tool so you know what each solution specializes in.

If you’re looking for more resources on the best free, open source, or premium network monitoring tools and vendors, our 2019 Network Monitoring Buyer’s Guide has you covered! It contains profiles on the top 28 network monitoring providers in the market today, including descriptions of the tools they offer and noteworthy features of each. The guide also features 10 questions you should ask prospective vendors and yourself before buying a network monitoring solution. You can check out that guide here!

AppNeta PathTest

appneta free open source network monitoring toolsAppNeta PathTest is a free network capacity testing tool designed to help businesses understand the true capacity of their network. PathTest seeks to improve layer 3 and layer 4 performance by displaying an accurate picture of your network’s maximum capabilities. It deliberately floods your network with data packets to fill the network to its full capacity. Users can set the duration of this test up to a maximum of 10 seconds and run the tests at any time.


Cacti

cacti free open source network monitoring toolsCacti is an open source network monitoring tool based on RRDTool’s data logging and graphing system. The tool uses network polling and data collection functionality to gather information on devices on networks of any size. This includes the ability to design custom scripts for data collection alongside support for SNMP polling. It then displays this information in easy-to-understand graphs which can be arranged in whatever hierarchy your business is most comfortable with.


EventSentry Light

eventsentryEventSentry Light is a free version of EventSentry’s SIEM, server monitoring, and network monitoring tool suite. The Light version still features the same event log monitoring capabilities as the full version, so your enterprise can collect and interpret data from logs on devices connected to your network. EventSentry Light also handles system health monitoring functions, including service monitoring, performance issue monitoring, and hardware failure monitoring.


Famatech Advanced IP Scanner

famatech advanced ip scannerFamatech’s Advanced IP Scanner is a free network monitoring scanning tool that provides analysis on LAN networks and devices. Advanced IP Scanner allows you to scan for devices on your network and remotely control connected computers and nodes. You can switch computers off from the tool if you know that the device isn’t in use and is utilizing valuable resources. The tool connects with Famatech’s Radmin solution for remote IT management, so you can manage IPs from anywhere.


Icinga

icinga free open source network monitoring toolsIcinga is an open source network monitoring tool that measures network availability and performance. Through a web interface, your enterprise can observe hosts and applications across your entire network infrastructure. The tool is natively scalable and can easily be configured to work with every kind of device. There are also a handful of Icinga modules for specific monitoring capabilities, such as monitoring for VMWare’s vSphere cloud environment and business process modelling.


LibreNMS

librenmsLibreNMS is an open source network monitoring system that uses several network protocols to observe every device on your network. The LibreNMS API can retrieve, manage, and graph the data it collects and supports horizontal scaling to grow its monitoring capabilities alongside your network. The tool features a flexible alerting system that is tailor-made to communicate with you via the method that works best for your company. They offer native iOS and Android apps as well.


LogRhythm NetMon Freemium

logrhythm free open source network monitoring toolsLogRhythm NetMon Freemium is a free version of LogRhythm NetMon that provides the same enterprise-grade packet capturing and analysis capabilities as the full version. While there are limits on packet storage and data processing, The freemium version still allows users to perform network threat detection and response functions based on data packet analysis. It also provides the same network threat alerting system as the full version, allowing you to stay up to date on your network’s performance and security.


Nagios Core

naigos free open source network monitoring toolsNagios Core is a free network monitoring tool designed as the basis for other monitoring and alerting software offered by Nagios. It is primarily a performance check tool that schedules and executes checks for network performance across the entire infrastructure. As the event processor for performance checks used by other Nagios software, Nagios Core is also able to extend its capabilities with independent add-ons via the Naigos Exchange.


Observium Community

observium free open source network monitoring toolsObservium Community is the free version of Observium’s network monitoring tool. With the free version, you can monitor an unlimited amount of devices while also taking full advantage of Obersvium’s network mapping features. The Observium network monitoring platform features automatic discovery of connected devices. It also comes equipped with discovery protocols to ensure that the map of your network is up to date. This way, you can account for new devices as they connect to the network.

Our Network Monitoring Buyer’s Guide contains profiles on the top network performance monitor vendors, as well as questions you should ask providers and yourself before buying.

Pandora FMS

pandora fms free open source network monitoring toolsPandora FMS is an open source monitoring tool that helps companies observe their entire IT infrastructure. It not only features network monitoring capabilities, but also Windows and Unix servers and virtual interfaces. For networks, Pandora FMS contains features such as ICMP polling, SNMP support, network latency monitoring, and system overload. You can also install agents on devices to observe factors like device temperature and overheating, as well as logfile occurrences.


Paessler PRTG 100

paessler free open source network monitoring toolsPaessler PRTG 100 is a network monitoring tool that offers a free version: PRTG 100. PRTG offers this tier of their monitoring program that supports 100 devices on a single network. PRTG’s monitoring features include capabilities to track network traffic, applications, data packets, and bandwidth. The software functions as an all-in-one monitoring suite which is also able to monitor cloud environments, virtual machines, and hardware in addition to a network.


Prometheus

prometheus monitoringPrometheus is an open source monitoring solution focused on data collection and analysis. It allows users to set up network monitoring capabilities using the native toolset. The tool is able to collect information on devices using SNMP pings and examine network bandwidth usage from the device perspective, among other functinos. The PromQL system analyzes data and allows for the program to generate graphs, tables, and other visuals on the systems it monitors.


SolarWinds Real-Time Bandwidth Monitor

solarwinds free open source network monitoring toolsSolarWinds Real-Time Bandwidth Monitor is a free bandwidth monitoring tool. The tool tracks bandwidth usage in real-time and displays graphs on your network’s bandwidth based on bandwidth polling. The tool alerts you when bandwidth usage enters a critical state, letting your enterprise instantly know when your network’s bandwidth is running low. You can define critical bandwidth usage levels yourself so the tool knows exactly when the devices on your network are using too much bandwidth.


Spiceworks Network Monitor

spiceworks free open source network monitoring toolsSpiceworks Network Monitor is a free network monitoring program and one of several networking tools that Spiceworks offers. Their monitoring solution offers real-time monitoring capabilities for networks and devices. You can perform ping checks to verify that your network and all connected nodes are currently functional. The tool also supports common network protocols, like HTTP and SIP, or user-defined custom protocols, as well as custom settings for alerts based on sensitivity.


Telerik Fiddler

telerik free network monitoring toolsTelerik Fiddler is a free web monitor and debugging proxy program. The tool is designed specifically for HTTP and HTTPS monitoring, with Fiddler’s web traffic monitoring and data collection capabilities. It can also debug web traffic by ensuring that the proper cookies, headers, and cache directives are being transferred. Fiddler also has a focus on network monitoring by delivering HTTP caching and data compression, in addition to finding performance bottlenecks.


Wireshark

wiresharkWireshark is an open source network protocol analyzer that features live network data capture and analysis. The tool executes deep inspections of several different network protocols to determine your network performance on multiple levels. Wireshark also allows users to capture data packets and analyze them even when the network is offline. Data that Wireshark captures can be stored in many universal or shared file formats, allowing other tools to help interpret the data on your network.


Zabbix

zabbixZabbix is an open source monitoring tool suite that includes network monitoring. The network monitoring capabilties of Zabbix includes performance metric analysis, such as bandwidth usage, packet loss, and CPU/memory utilization. It can also detect network node and connection health problems by checking for devices in critical condition. Zabbix can alert you when hardware functions are dropping (fan speed of a network device is low) or when an SNMP check is not responded to.


Looking for a solution to help you improve your network performance? Our Network Monitoring Buyer’s Guide contains profiles on the top network performance monitor vendors, as well as questions you should ask providers and yourself before buying.

Check us out on Twitter for the latest in Network Monitoring news and developments!

Daniel Hein

Dan is a tech writer who writes about Enterprise Cloud Strategy and Network Monitoring for Solutions Review. He graduated from Fitchburg State University with a Bachelor's in Professional Writing. You can reach him at dhein@solutionsreview.com
Daniel Hein