GOG.com is giving away free copies of the classic Aliens vs. Predator 2000 for free.
The promotion is valid throughout the next 48 hours. It’s done as part of the testing phase for Galaxy, GOG’s desktop client.
You will need to register an account, if you don’t have one, and you’ll be emailed the game code.
As with all games on the service, it has been updated to work on modern systems, it even includes support for Xbox 360 controllers. You can play as the marine, Alien or Predator in the game’s campaign.