LazyCam is a beta-release free importer included with Mach3. It's purpose is to import standard dxf, cmx, and other file types to allow those that do not use CAM programs to more easily generate Gcode to be run under Mach3.
The free edition of LazyCam that is included with Mach3 carries no cost.
However, there is an optional PRO level upgrade that turns on advanced features such as object offsetting, pocketing, primary foam functions, importation of DXF profiles for conversion to Lathe turning code, etc. It is optional, but gives one the ability to do more advanced importation of objects.