System of tools which is based on the LDraw Parts Library and File Format. Original software package written by James Jessiman in 1996. Included ldraw.exe, the original renderer.

LDraw is a popular system of free software tools for modeling Lego creations in 3D. The LDraw file format and original program were written by James Jessiman. He also modeled many of the original parts in the parts library that is central to the program.