- [Fabric](http://www.fabfile.org/) - Python library and cli tool for streamlining the use of SSH for application deployment or systems administration tasks.
- [Mina](http://nadarei.co/mina/) - Really fast deployer and server automation tool (rake based).
- [munki](https://www.munki.org/munki/) - Webserver-based repository of packages and package metadata, that allows macOS administrators to manage software installs.
- [Rocketeer](http://rocketeer.autopergamene.eu/) - PHP task runner and deployment tool.
- [sup](https://github.com/pressly/sup/) - Super simple deployment tool - just Unix - think of it like 'make' for a network of servers.
- [Vlad the Deployer](https://github.com/seattlerb/vlad) - Deployment automation (rake based).
- [Adagios](http://adagios.org/) - Web based Nagios interface for configuration and monitoring (replacement to the standard interface), and a REST interface, [SourceCode](https://github.com/opinkerfi/adagios), [Documentation](https://github.com/opinkerfi/adagios/wiki))
- [Alerta](https://github.com/guardian/alerta) - Distributed, scaleable and flexible monitoring system.
- [Bloonix](https://bloonix-monitoring.org/) - Bloonix is a monitoring solution that helps businesses to ensure high availability and performance. `GPL-3.0``Perl`
- [Bosun](http://bosun.org/) - Monitoring and alerting system by Stack Exchange ([Source Code](https://github.com/bosun-monitor/bosun), [Documentation](http://bosun.org/quickstart.html)) `MIT``Go`
- [Cabot](http://cabotapp.com/) - Monitoring and alerts, similar to PagerDuty.
- [Cacti](http://www.cacti.net) - Web-based network monitoring and graphing tool.
- [Adagios](http://adagios.org/) - Web based Nagios interface for configuration and monitoring (replacement to the standard interface), and a REST interface. ([Source Code](https://github.com/opinkerfi/adagios)) `AGPL-3.0``Docker/Python`
- [Bloonix](https://bloonix-monitoring.org/) - Bloonix is a monitoring solution that helps businesses to ensure high availability and performance. ([Source Code](https://github.com/bloonix)) `GPL-3.0``Perl`
- [Bosun](http://bosun.org/) - Monitoring and alerting system by Stack Exchange ([Source Code](https://github.com/bosun-monitor/bosun)) `MIT``Go`
- [Cabot](http://cabotapp.com/) - Monitoring and alerts, similar to PagerDuty. ([Source Code](https://github.com/arachnys/cabot)) `MIT``Python`
- [cadvisor](https://github.com/google/cadvisor) - Analyzes resource usage and performance characteristics of running containers ([Source Code](https://github.com/google/cadvisor)) `Apache-2.0``Go`
- [checkmk](https://checkmk.com/) - Comprehensive solution for monitoring of applications, servers, and networks. ([Source Code](https://github.com/tribe29/checkmk)) `Python/PHP`
- [Dash](https://github.com/afaqurk/linux-dash) - A low-overhead monitoring web dashboard for a GNU/Linux machine.
- [EdMon](https://github.com/Edraens/EdMon) - A command-line monitoring application helping you to check that your hosts and services are available, with notifications support. `MIT``Java`
- [ElastiFlow](https://github.com/robcowart/elastiflow) - Network flow Monitoring (Netflow, sFlow and IPFIX) with the Elastic Stack.
- [eZ Server Monitor](http://www.ezservermonitor.com) - A lightweight and simple dashboard monitor for Linux, available in Web and Bash application.
- [Healthchecks](https://healthchecks.io/) - Monitoring for cron jobs, background services and scheduled tasks.
- [Icinga](https://www.icinga.com/) - Nagios fork that has since lapped nagios several times. Comes with the possibility of clustered monitoring - ([Source Code](https://github.com/Icinga)) - `GPLv2`
- [LibreNMS](http://www.librenms.org) - Fully featured network monitoring system that provides a wealth of features and device support.
- [Monit](http://mmonit.com/monit/#home) - Small utility for managing and monitoring Unix systems.
- [Netdata](https://www.netdata.cloud/) - Distributed, real-time, performance and health monitoring for systems and applications. Runs on Linux, FreeBSD, and MacOS.
- [NetXMS](https://www.netxms.org/) - Open Source network and infrastructure monitoring and management. ([Source Code](https://github.com/netxms/netxms))
- [eZ Server Monitor](http://www.ezservermonitor.com) - A lightweight and simple dashboard monitor for Linux, available in Web and Bash application. ([Source Code](https://github.com/shevabam/ezservermonitor-web)) `GPL-3.0``PHP/Shell`
- [Healthchecks](https://healthchecks.io/docs/self_hosted/) - Monitoring for cron jobs, background services and scheduled tasks. ([Source Code](https://github.com/healthchecks/healthchecks)) `BSD-3-Clause``Python`
- [Icinga](https://www.icinga.com/) - Nagios fork that has since lapped nagios several times. Comes with the possibility of clustered monitoring. ([Source Code](https://github.com/Icinga/icinga2)) `GPL-2.0``C++`
- [LibreNMS](http://www.librenms.org) - Fully featured network monitoring system that provides a wealth of features and device support. ([Source Code](https://github.com/librenms/librenms)) `GPL-3.0``PHP`
- [Linux Dash](https://github.com/afaqurk/linux-dash) - A low-overhead monitoring web dashboard for a GNU/Linux machine. `MIT``Nodejs/Go/Python/PHP`
- [Monit](http://mmonit.com/monit/#home) - Small utility for managing and monitoring Unix systems. ([Source Code](https://bitbucket.org/tildeslash/monit/src/master/)) `AGPL-3.0``C`
- [Naemon](http://www.naemon.org/) - Network monitoring tool based on the Nagios 4 core with performance enhancements and new features. ([Source Code](https://github.com/naemon/naemon-core)) `GPL-2.0``C`
- [Netdata](https://www.netdata.cloud/) - Distributed, real-time, performance and health monitoring for systems and applications. Runs on Linux, FreeBSD, and MacOS. ([Source Code](https://github.com/netdata/netdata)) `GPL-3.0``C`
- [NetXMS](https://www.netxms.org/) - Open Source network and infrastructure monitoring and management. ([Source Code](https://github.com/netxms/netxms)) `LGPL-3.0/GPL-3.0``Java/C++/C`
- [Observium](http://www.observium.org/) - SNMP monitoring for servers and networking devices. Runs on linux.
- [OMD](http://omdistro.org/) - The Open Monitoring Distribution.
- [Performance Co-Pilot](http://pcp.io) - Lightweight, distributed system performance and analysis framework.
- [PHP Server Monitor](https://www.phpservermonitor.org/) - Open source tool to monitor your servers and websites
- [PhpSysInfo](https://phpsysinfo.github.io/phpsysinfo/) - A customizable PHP script that displays information about your system nicely.
- [psdash](https://github.com/Jahaja/psdash) - A linux system information web dashboard using psut ils and flask.
- [pyDash](https://k3oni.github.io/pydash/) - Small web-based monitoring dashboard for linux.
- [Riemann](http://riemann.io/) - Flexible and fast events processor allowing complex events/metrics analysis.
- [rtop](https://github.com/rapidloop/rtop) - an interactive, remote system monitoring tool based on SSH.
- [PHP Server Monitor](https://www.phpservermonitor.org/) - Open source tool to monitor your servers and websites. ([Source Code](https://github.com/phpservermon/phpservermon))
- [PhpSysInfo](https://phpsysinfo.github.io/phpsysinfo/) - A customizable PHP script that displays information about your system nicely. ([Source Code](https://github.com/phpsysinfo/phpsysinfo))
- [pyDash](https://k3oni.github.io/pydash/) - Small web-based monitoring dashboard for linux. ([Source Code](https://gitlab.com/k3oni/pydash))
- [Riemann](http://riemann.io/) - Flexible and fast events processor allowing complex events/metrics analysis. ([Source Code](https://github.com/riemann/riemann))
- [rtop](https://github.com/rapidloop/rtop) - an interactive, remote system monitoring tool based on SSH. ([Source Code](https://github.com/rapidloop/rtop))
- [Scrutiny](https://github.com/AnalogJ/scrutiny) - Hard Drive S.M.A.R.T Monitoring, Historical Trends & Real World Failure Thresholds
- [ServerStatus BotoX](https://github.com/BotoX/ServerStatus) - Display and monitor your servers statistics in a beatiful way.
- [ServerStatus moejda](https://github.com/mojeda/ServerStatus) - Server Status website script, displays uptime (days), free RAM, free HDD
- [Thruk](http://www.thruk.org/) - Multibackend monitoring web interface with support for Naemon, Nagios, Icinga and Shinken.
- [Uchiwa](https://uchiwa.io/) - Simple dashboard for sensu.
- [Vector](https://github.com/Netflix/vector/) - An on-host performance monitoring framework.
- [Xymon](https://www.xymon.com/) - Network monitoring inspired by Big Brother.
- [Zabbix](http://www.zabbix.com/) - Enterprise-class software for monitoring of networks and applications.
- [Zenoss](http://community.zenoss.org) - Application, server, and network management platform based on Zope.
- [Sensu](https://sensu.io/) - Monitoring tool for ephemeral infrastructure and distributed applications. ([Source Code](https://github.com/sensu/sensu-go))
- [Thruk](http://www.thruk.org/) - Multibackend monitoring web interface with support for Naemon, Nagios, Icinga and Shinken. ([Source Code](https://github.com/sni/Thruk))
- [Zabbix](http://www.zabbix.com/) - Enterprise-class software for monitoring of networks and applications. ([Source Code](https://git.zabbix.com/projects/ZBX/repos/zabbix/browse))