Lexica - An open source word-search game.
Unity - The multiplatform game creation tools for everyone.
Crosswords Arena - Word game, multiplayer and computer players
Godot Engine - Feature-packed 2D and 3D open source game engine.
Word Domination - Word Domination is a fast paced and addictive real-time word game.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.