The Linux Game Tome notes that the final team to produce a fully Open Source 3D game using the CrystalSpace engine and Blender has been chosen. The project (known as Apricot) aims to produce a cross-platform, 3D game with completely Free (CCA) graphics, music and code. An important side-effect of the project is to improve open source tools for the professional game development industry.

http://www.happypenguin.org/newsitem?id=7912 
http://www.crystalspace3d.org/main/Main_Page
http://www.blender.org/
http://apricot.blender.org/