Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
NullpoMino - NullpoMino is an open-source action puzzle game that works on the Java platform.
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
Blockinger - An open source Tetris clone for Android.
Listary - Listary is a revolutionary search utility for Windows
Good Old Tetris - Play Tetris Online. The game that will never get old.