ReplicatorG is a simple, open source 3D printing program
This is the software that will drive your MakerBot Replicator, Thing-O-Matic, CupCake CNC, RepRap machine,
or generic CNC machine. You can give it a GCode or STL file to process,
and it takes it from there. It's cross platform, easily installed, and
is based on the familiar Arduino / Processing environments. ReplicatorG
is used by thousands of MakerBot Operators, and has printed tens of
thousands of 3D objects and counting.http://replicat.org/