React Native Desktop - Build OS X desktop apps using React Native
NullpoMino - NullpoMino is an open-source action puzzle game that works on the Java platform.
Arbiter IDE - The offline-friendly, in-browser IDE for pure JS prototypes
Blockinger - An open source Tetris clone for Android.
CodeOnline - A remote and secure workspace powered by VSCode
Good Old Tetris - Play Tetris Online. The game that will never get old.