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

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

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

Blockinger - An open source Tetris clone for Android.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.

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