Spring

Spring Engine (also known as SpringRTS or formerly TA Spring), is a game engine for real-time strategy (RTS) video games originally created by Stefan Johansson and Robin Westberg, members of the Swedish Yankspankers game clan.Originally intended to bring the gameplay experience of Total Annihilation into three dimensions, the engine has since evolved to support a plethora of more modern and more flexible features, including built-in high-level extensibility through a Lua scripting interface. The core game engine is free and open-source software, subject to the terms of the GNU General Public License (GPL) version 2.