OpenNMS Horizon is described as 'OpenNMS is an open-source network monitoring platform that helps you visualize and monitor everything on your local and distributed networks' and is a Network Monitor in the network & admin category. There are more than 50 alternatives to OpenNMS Horizon for a variety of platforms, including Linux, Windows, Web-based, Self-Hosted and Mac apps. The best OpenNMS Horizon alternative is Zabbix, which is both free and Open Source. Other great apps like OpenNMS Horizon are Nagios, Datadog, Prometheus and Spiceworks.
Agentless monitor covers most of the aspects of monitoring like JAVA / J2EE application monitoring, server monitoring, database monitoring, transaction monitoring, network monitoring, log monitoring and system monitoring and last, but not the least is available for free.
United States
LANState is a simple NMS with the network topology mapping and device monitoring functions. Add hosts to a graphical network map and monitor their state in the real time. Receive failure notifications when hosts and services go down.
Russia
AggreGate Network Manager is an enterprise-grade IP network management, monitoring and supervision system based on AggreGate Device Management Platform.
Taiwan
