Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

NullpoMino - NullpoMino is an open-source action puzzle game that works on the Java platform.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Blockinger - An open source Tetris clone for Android.

EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

Good Old Tetris - Play Tetris Online. The game that will never get old.