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OpenSCAD is software for creating solid 3D CAD models. It is free software and available for Linux/UNIX, Windows and Mac OS X. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the CAD aspects. Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating...
DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
DXF2GCODE is a tool for converting 2D (dxf, pdf, ps) drawings to CNC machine compatible GCode.
Windows, Linux, and Mac support by using python scripting language.
ScopeShapes uses the left and right sound outputs of your computer to control the X- and Y- axes of an oscilloscope in order to generate 2D and 3D shapes. It reads AutoCAD-format ASCII .dxf files, and runs on Linux, Win32, and Mac OS X.