ye-mt's Stars
DiamondLightSource/pmac
Driver for the Delta Tau PMAC motion controller family.
MarlinFirmware/Marlin
Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
Smoothieware/Smoothieware
Modular, opensource, high performance G-code interpreter and CNC controller written in Object-Oriented C++
synthetos/g2
g2core - The Next Generation
synthetos/TinyG
Affordable Industrial Grade Motion Control