Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Tanglet - Tanglet is a single player word finding game based on Boggle.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Crosswords Arena - Word game, multiplayer and computer players
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
Quackle - Open-source word game similar to Scrabble. Features a board editor, analysis tools, and artificial intelligence that rivals the best players in the world!