Speedcube - A simple and elegant Rubik's cube solve timer
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Linia - You will never look at colors the same way...
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Colorcube - Turn pieces and blend colors in this minimal puzzler
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.