Slic3r takes 3D models (STL, OBJ, AMF) and converts them into G-code instructions for 3D printers. It's compatible with any modern printer based on the RepRap toolchain, including all those based on the Marlin, Sprinter and Repetier firmware. It
also works with Mach3, LinuxCNC and Machinekit controllers.
NOTE: This is only to provide appimages, I am not the developer.