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LinuxCNC
(www.linuxcnc.org)
From Newcomers to Old Timers, a community united by the Industry of Machining
Rules Don't post illegal stuff
Don't post Porn (no sexy aluminum surface finishes don't count)
Don't be an asshat (harassment, bullying etc.)
If you're going to post NSFW stuff, flag it as NSFW, It's ok to post shop Screwups (blood/cuts) just make sure to flag it as NSFW
and Finally make sure to have a good time :D
I have used this extensively. It should be known that it isn't just a program, this is a full in Debian based distribution. If you are setting up a machine that isn't a hobbyist machine and closer to a full industry production machine, you will need some intimate knowledge of the control boards to get this running, and even then it can take serious trial and error. The forums are great, though and people are very helpful.