Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Hollow Knight - Descend into the Dark Venture down into a beautiful, ruined world of insects and heroes
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
SuperTux - SuperTux is a classic 2D jump'n run sidescroller game in a style similar to the original Super...
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.