Breadth-first search - Game Development
Kythera - Kythera is an AI middleware middleware plus development services with a complete solution for AI in games.
Havok AI - Havok AI is a runtime SDK for programmers and designers to create pathfinding, pathfollowing, and navigation mesh generation for dynamic environments.
Shiva Engine - Shiva Engine is a cross-platform development solution.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Unity - The multiplatform game creation tools for everyone.