Aliens versus Predator is a science fiction first-person shooter computer game developed by Rebellion Developments and published by Sierra On-Line, Inc. for PC and Apple Macintosh computers in 1999. It is based on the Alien and Predator media franchises and the crossover Alien vs. Predator franchise. It was unofficially ported to Linux in 2001 and Xbox in 2009, following Rebellion’s public release of the game’s source code. Download aliens vs predators classic game for PC.