Software
GOBLINXNA
Goblin XNA is a platform for research on 3D user interfaces, including mobile augmented reality and virtual reality, with an emphasis on games. It is written in C# and based on Microsoft XNA Game Studio 3.1 (up to Goblin XNA v3.6) and 4.0 (after Goblin XNA v4.0).
Mercury
The Mercury messaging toolkit is a new way to handle cross-component communication in the Unity game engine. It integrates seamlessly with the Unity Editor, and is both robust and expandable.