Computer and Videogames.com has a feature up extolling 1999’s Aliens vs. Predator as “the best Aliens game ever made” by virtue of its mauling features:
Shoot an Alien directly in the head and, with a suitably melon-squelching noise, it’ll drop dead. Shoot it in the arm, and you have yourself an amputee Alien. A very angry amputee Alien, spraying deadly acid from its chitinous stump, which eats through your armour and flesh.
As the article also mentions, AvP is one of the scariest games I’ve ever played, and one of the scant few that’s actually made me jump out of my skin (I HATE FACEHUGGERS. I HATE THEM!).
In a generous gesture, developer Rebellion released the source code to AvP many years ago, which Steven “relnev” Fuller subsequently ported to Linux (albeit without multiplayer support). There are no binaries available, but it’s not hard to compile the source tree. You can also still get the game itself from various vendors on Amazon.
If you’re a sci-fi/horror or first-person shooter fan, I highly recommend giving it a spin, as it still holds up well even today.