LinuxCNC (the Enhanced Machine Control) - LinuxCNC: an open source CNC machine controller. It can drive milling machines, lathes, 3d printers, laser cutters, plasma cutters, robot arms, hexapods, and more.
SOLIDWORKS CAM - SOLIDWORKS CAM is an add-in that provides you the leverage of computer-aided manufacturing, allowing you to generate g-code and m-code for CNC machining of different parts.
Mach3 - Mach3 is very popular among the Hobby CNC community.
Inventor CAM - Inventor CAM is one of the agile, integrated CAM software, aiding out users to streamline their manufacturing process having rich functionalities and features in place.
SolidCAM - The ‘Best-in-Class’ CAM Solution for Efficient & Profitable CNC-Programming Inside Your CAD
Autodesk Fusion 360 - Integrated CAD, CAM, and CAE featuring collaborative editing and cloud-based computation.