Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
Chef - Automation for all of your technology. Overcome the complexity and rapidly ship your infrastructure and apps anywhere with automation.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services