Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Diff So Fancy - Make Git diffs look good
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Git Flow - Git Flow is a very self-explanatory free software workflow for managing Git branches.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Working Copy - The powerful Git client for iOS