From Rigs of Rods Wiki
- Sketchup Plugins - Sketchup -> RoR Export Tool
This plug-in is out of date. it doesn't work on anything newer than Sketchup 6.
- Blender Plugins - Blender Truck Import/Export Tool by Thomas
- Blender Ogre Plugins - Blender Mesh Import/Export Tool and 3ds2mesh (Latest Here)
- Blender Nodes and Beam Plugin - Displays currently selected nodes and beams
- Blender Rigidity Plugin - Creates a rigid beam structure within selected nodes (by mcreed)
AC3D Plugins The AC3D Import/Export Tool!
Circle Coordinate Calculator
Circle Coordinate Calculator Calculates X,Y Coordinates for a circle!
look also there for more information: http://www.ogre3d.org/tikiwiki/DCC+Tools