Developed by 4D Rulers Software, Gore Special Edition is a remake of the full original GORE: Ultimate Soldier game with many improvements, new features, levels, weapons and more. And best of all it is completely free. A patch is also available.
I'm not sure what type of engine it uses but I'm positive Spidey will find out
[SAS]_LCpl_Ade Lance Corporal (LCpl) 22nd Elite Virtual Regiment.