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

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

Blockinger - An open source Tetris clone for Android.

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

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

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.