GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Antichamber - "A game with half of the attention to detail and imagination Antichamber has would be a smash hit - this bare-bones first-person puzzler is one of the most thought-provoking, engaging, and challenging video games ever developed.
Redmine - Flexible project management web application
The Stanley Parable - The Stanley Parable is an Action, First-person Perspective, Puzzle-Platform, Exploration and Single-player video game created and published by Galactic Cafe.
Bugs Everywhere - Bugs Everywhere is a “distributed bugtracker”, designed to complement distributed revision control systems.
Scribblenauts - Scribblenauts is an Action, Puzzle and Single-player video game developed by 5th Cell and published by Warner Bros.