GGGManLives: Half-Nuked Duke Nukem Mod for Half-Life!
Half-Nuked is a mod for Half-Life which replaces Gorden Freeman and his arsenal of weapons with Duke Nukem and a complete weapons overhaul. There are no new levels at this point, but I see a lot of potential with this mod. It was just recently covered by none other than GGGManLives. Take a few minutes and check out his video on the subject.