Unity - The multiplatform game creation tools for everyone.
Tanglet - Tanglet is a single player word finding game based on Boggle.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Crosswords Arena - Word game, multiplayer and computer players
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
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!