Gunman Chronicles is a futuristic first-person shooter computer game using the Half-Life game engine. It was originally planned as a total conversion for Quake; it then switched games to Quake II, followed by another switch to Half-Life, before being spotted by Valve Software and released as a stand-alone retail product in 2000.
What is the name of this monster?!
Hunter/Destroyer Drone I believe?
I can see a definite resemblance to an original HL Gargantua ;)
Yet, seriously. Gunman Chronicles was very advance mod. It CAN still be playable as mod, but I do think, it was made out of respect to HL engine!
(For example, you can't just load the game SIN and Solder of fortune as a mods for Quake2