OpenNMS is described as 'enterprise grade network monitoring and network management platform developed under the free software or open source model. It consists of a community-supported, free-software project as well as an organization offering commercial services, training and support' and is an app in the Network & Admin category. There are more than 50 alternatives to OpenNMS for a variety of platforms, including Linux, Windows, Online / Web-based, Mac and Self-Hosted solutions. The best alternative is Zabbix, which is both free and Open Source. Other great apps like OpenNMS are Nagios (Freemium, Open Source), Prometheus (Free, Open Source), Spiceworks (Free) and Datadog (Paid).
Gather and analyze accurate statistics and performance metrics, visualize it, get notified about current and potential issues without delay, and take advantage of our time-tested professional development and support.
Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Since its inception in 2012, many companies and organizations have adopted Prometheus, and the project has a very active developer and user community.
Datadog is a monitoring service for IT, Dev & Ops teams who write and run applications at scale, and want to turn the massive amounts of data produced by their apps, tools and services into a unified view of IT infrastructure. 120+ Integrations!.
An advanced network monitoring solution to monitor network up/downtime, traffic and usage. Features include availability, performance, and bandwidth monitoring (SNMP, WMI, packet sniffing, NetFlow), instant alerts, reporting, failover clustering.
Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.