StructureSynth is an extension to three dimensions of the concepts in ContextFree. The software is fast, as stable as it needs to be, and fun to experiment with. One of the key features of an open source software is its community, and the StructureSynth community is vigorous - have a look at the latest work. A pipeline exists for taking creations from StructureSynth into Blender, POVRay, Renderman, and SunFlow.