On http://www.simviation.com/fsdesign_aircraft1.htm there is:
- FS Design Studio - now in Version 3: A versatile & easy to learn FS Design Utility By Louis Sinclair - produces FS2004, FS2002, FS2000 & CFS2 aircraft & 3d objects;
- G-Max : 3d CAD style design utility specifically aimed towards MSFS. Initially came with Flight Simulator 2002 Professional Edition & is used for FS2004, FS2002 & CFS3 aircraft;
- AD-2000. Aircraft Designer 2002 v1.2 LT. AD2K2 is a tool dedicated to the designers of aircraft for Flight Simulator 2002