OSE Requirements

Is open source, and native in Linux
Can work on any computer
Can work for multiple application
Has separate interoperable modules for CAD, toolpath generation, and machine control
Applicable to stepper motors, servos, and many auxiliary functions such as feedback from a plasma torch, digital readout, end stops, and can control other outputs such as cutting gas turn-on in oxyacetylene cutting
Can work with or without feedback
Is well-documented, scalable, and multipurpose
Fits with the rest of the GVCS architecture

Links

FreeCAD is developing a CAM plugin - the Path Module - [1]
HeeksCAD for Ubuntu - 2014 - [2]
http://www.thebitbangtheory.com/2012/01/cnc-software-toolchain-linux/ - somewhat outdated