Observium

ManageEngine OpManager

ManageEngine OpManager provides real‑time visibility into network performance, servers, and applications, helping IT teams proactively detect and resolve issues. Its web‑based console consolidates monitoring data, alerts, and reports in a single pane of glass. Designed for network administrators, OpManager automates device discovery, fault management, and capacity planning, while integrating seamlessly with other ManageEngine solutions and ITSM tools. The platform supports scalable deployments for small offices to large enterprises.

LibreNMS

LibreNMS is a free, open-source network monitoring system that automatically discovers devices across a network using protocols like CDP, LLDP, OSPF, BGP, SNMP, and ARP, then continuously polls them for health and performance data. It's built to scale horizontally through distributed polling, which lets it handle networks ranging from a handful of switches to large, geographically distributed infrastructure. Alerting is highly configurable and can notify via email, IRC, Slack, and other channels, and the platform ships a full API for pulling monitoring data into other systems or dashboards. It integrates with tools like NfSen, collectd, SmokePing, RANCID, and Oxidized for flow analysis and configuration backup, and includes optional bandwidth billing based on port usage, making it a common choice for ISPs and network administrators who want a self-hosted alternative to commercial NMS products.

OpenNMS Horizon

OpenNMS Horizon is an open-source network management platform that provides fault, performance, and availability monitoring for large, heterogeneous networks. It offers a flexible, modular architecture that can be customized to fit the needs of service providers, enterprises, and research institutions. The platform includes a powerful event engine, customizable dashboards, and extensive reporting capabilities, all backed by a robust API for integration with third‑party tools. Horizon is community‑driven and can be deployed on‑premises or in private clouds, giving organizations full control over their monitoring data.

Skydive

Skydive is a network topology and protocol analyzer that provides a real-time, global view of your entire network infrastructure. It actively probes devices and captures traffic to build a dynamic, interactive map of all your network elements, including hosts, switches, routers, and virtual machines. This makes it an invaluable tool for network engineers and DevOps teams who need to troubleshoot issues, monitor performance, and understand complex network dependencies. The platform excels at automating network discovery, eliminating the need for manual inventory tracking. It uses a combination of active probing and passive traffic capture to continuously update its topology map, ensuring that you always have an accurate picture of your network's current state. With Skydive, you can drill down into specific nodes to view real-time metrics, inspect flows, and even replay captured packets for deep analysis. Skydive is particularly well-suited for dynamic environments like Kubernetes clusters and cloud-based infrastructures, where network topologies change frequently. Whether you're a network administrator looking to pinpoint a connectivity problem, a security analyst investigating suspicious traffic, or a developer trying to understand how your microservices communicate, Skydive offers the visibility you need. It is an open-source project that can be self-hosted, providing flexibility and control over your network monitoring data.

SolarWinds Network Performance Monitor

SolarWinds Network Performance Monitor (NPM) delivers comprehensive, real-time insight into network health, performance, and availability. It helps IT professionals quickly identify bottlenecks, troubleshoot issues, and ensure optimal network operation across complex environments. Built on the SolarWinds Orion Platform, NPM integrates seamlessly with other SolarWinds tools, offering customizable dashboards, alerts, and reporting to streamline network management and reduce downtime.