Source is a 3D game engine developed by Valve.It debuted as the successor to GoldSrc with Half-Life: Source in June 2004, followed by Counter-Strike: Source and Half-Life 2 later that year. Source does not have a concise version numbering scheme; instead, it is designed in constant incremental updates. The engine was succeeded by Source 2

Ego Game Technology Engine is a video game engine developed by Codemasters.While it is primarily used for racing games, it has also been used in a few first-person shooters.. Ego is a modified version of the Neon game engine that was used in Colin McRae: Dirt and was developed by Codemasters and Sony Computer Entertainment using Sony Computer Entertainment's …