GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Git - Git is a free and open source version control system designed to handle everything from small to very large projects with speed and efficiency. It is easy to learn and lightweight with lighting fast performance that outclasses competitors.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Mercurial SCM - Mercurial is a free, distributed source control management tool.
Linux Dash - A drop-in, low-overhead monitoring web dashboard for a Linux machine.