Tetris Attack - Tetris Attack is a Single and Multiplayer Puzzle video game released by Intelligent System for Nintendo.
Y-Productive - Keep your work and distractions under control
Tetris.com - Tetris Friends is an Online, Puzzle, Single and Multiplayer video game created by Tetris Online, Inc.
Serene - The macOS app to get your focus back
Freedom.to - Freedom is a productivity hack that lets you block apps, websites or the entire Internet on iPhones, iPads, Windows and Mac computers.
ProductiveApp.io - Productive is a habit tracking application.