[Andy Brockway]

You might try http://www.machsupport.com/
or http://www.dakeng.com/turbocnc.html

I have run both thru a xylotex control system. Both have the ability for you to tune the drivers. Mach has more features and I use it to develop the g-code but the computer I am running my CNC router is old, so I am running TurboCNC there.

There are many more free software solutions. These two are pretty common. Check out http://www.cnczone.com/