Some time ago I posted a couple of blogs about my behavior tree system for T3D.
I've finally managed to put of few more hours into this, and the project is now up on GitHub:
Visit the BadBehavior GitHub page
BadBehavior includes all of the 'standard' behavior tree nodes, tight integration with script, 'modular' tree construction and a fairly comprehensive tabbed editor that supports undo/redo etc. It should also drop right into existing projects with very minimal changes.
The BadBehavior Wiki contains some documentation and a getting started tutorial. It also includes a reference describing the node types and their parameters.
The system is currently based on T3D 3.6.2, I will be porting to T3D 3.7 when it is released. The scripts are only included with the FULL template as I got tired trying to keep both FULL and EMPTY updated.
I have released it under the MIT license, so you are free to use and abuse it in any way you like.