Ion Fury is a love letter to classic shooters and one of the best Build engine games out there.
Blood is a great Build engine game and a very memorable shooter thanks to its mix of darkness, humor, violence, and unique arsenal of weapons.
Shadow Warrior is one of the classic Build engine game with fun and satisfying gunplay and some poor design choices.
Duke Nukem Forever 2013 attempts to deliver the Duke Nukem Forever experience that was shown in 2001 and the result is better than the official game released in 2011.
Ion Maiden is aiming to be an old-school shooter that runs on the Build Engine which powered games like Duke Nukem 3D, the original Shadow Warrior, and Blood.