Rust - A safe, concurrent, practical language
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Go.CD - Open source continuous delivery tool allows for advanced workflow modeling and dependencies management.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
NIM - GB64.COM is the home of The Gamebase Collection of C64 games.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.