Jadex is a Belief Desire Intention (BDI) reasoning engine that allows for programming intelligent software agents in XML and Java. The resoning engine is very flexible.
1st 3D gameengine built in C# for .NET, Visual3D Engine's predecessor
The first 3D gameengine built in C# for .NET, predecessor to the Visual3D GameEngine (https://www.poweraccess.net/visual3d-game-engine), an All-in-One Game Development Tool for Next-Gen 3D Games, MMOs, Simulations and Virtual Worlds powered by Microsoft XNA.