FinalSun

FinalSun is a fan-made nearly feature-complete map editor for Command & Conquer Tiberian Sun and Firestorm. You can create multi-player maps and thanks to the integrated trigger editor even single-player missions as well as whole campaigns. It is based upon the Open Source XCC Utilities and integrates with SunEdit 2k which can be used to add new units to the map or modify existing ones. The successor FinalAlert 2 is quite identical and has been incorporated into the official release by EA.