You can extract models and textures!
Remember to flip models on X axis, also flip the uvmap or the texture vertically.
The textures are exported in BMP and these may have an alpha channel for transparency, models in wavefront OBJ.
Let me know if you have any major problems, some textures types are not supported yet just in very rare cases.
Some models have many parts, you can select "export only Last part" so you only get the visual model and not the cubes(bone/effectors positions) on models that have rigs.
Edit: this tool is no longer available, instead there's the new JSRF Tool 2
You might need to install NetFramework 4.0 to run the application