Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Synthesia - A fun way to learn how to play the piano.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Playground Sessions - Online piano learning game.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.