PandAI is open source and in fact is meant as a learning tool for users wanting to learn AI too.
This means that the entire source for PandAI, which was written in C++ and the mesh generators for path finding is available here :
Source Codes :
1. Pandai_v1.0_src.zip - This is the entire source code of PandAI + Doxygen documentation. (Open Source)
2. meshgen_v1.0_src.zip - This is the entire source code of the mesh generator for Maya and Max (Open Source)
3. BlenderMeshGen.zip - This is the python source code for the Blender mesh generator + few samples (Open Source)
Note that newer versions of Panda include PandaAI.