The Refractor Engine, is a game engine designed by Stockholm-based studio Refraction Games, first developed for the computer game Codename Eagle, which was released in November 1999. Since then, Refraction Games was bought by Digital Illusions CE, and working alongside with the Refraction Games team, designed and developed the Refractor 2 Engine for the famous Battlefield game series for the computer.
A good engine that can show us its performace through Battlefield 2 and 2142
With Mod Tools for game,you can even make it look as Frostbite 2 without destruction,even if its made in 2005.
The only problem with this engine is modding section,and instability while changing configurations or settings for it