Adagios - Web based Nagios interface for configuration and monitoring (replacement to the standard interface), and a REST interface. (Source Code) AGPL-3.0Docker/Python
cadvisor - Analyzes resource usage and performance characteristics of running containers. Apache-2.0Go
checkmk - Comprehensive solution for monitoring of applications, servers, and networks. (Source Code) GPL-2.0Python/PHP
dashdot - A simple, modern server dashboard for smaller private servers. (Demo) MITNodejs/Docker
EdMon - A command-line monitoring application helping you to check that your hosts and services are available, with notifications support. MITJava
eZ Server Monitor - A lightweight and simple dashboard monitor for Linux, available in Web and Bash application. (Source Code) GPL-3.0PHP/Shell
glances - Open-source, cross-platform real-time monitoring tool with CLI and web dashboard interfaces and many exporting options. (Source Code) GPL-3.0Python
Healthchecks - Monitoring for cron jobs, background services and scheduled tasks. (Source Code) BSD-3-ClausePython
Icinga - Nagios fork that has since lapped nagios several times. Comes with the possibility of clustered monitoring. (Source Code) GPL-2.0C++
LibreNMS - Fully featured network monitoring system that provides a wealth of features and device support. (Source Code) GPL-3.0PHP
Linux Dash - A low-overhead monitoring web dashboard for a GNU/Linux machine. MITNodejs/Go/Python/PHP
Monit - Small utility for managing and monitoring Unix systems. (Source Code) AGPL-3.0C
Netdata - Distributed, real-time, performance and health monitoring for systems and applications. Runs on Linux, FreeBSD, and MacOS. (Source Code) GPL-3.0C
NetXMS - Open Source network and infrastructure monitoring and management. (Source Code) LGPL-3.0/GPL-3.0Java/C++/C
Observium Community Edition - Network monitoring and management platform that provides real-time insight into network health and performance. QPL-1.0PHP