The Creatures series has been added to GOG.com. For $9.99 you'll get Creatures: The Albian Years (Creatures 1 & 2), Creatures Exodus (Creatures 3 & Docking Station) and Creatures Village (Creatures Adventures & Creatures Playground)
Creatures is a game that used clever programming to simulate life and allow players to breed animals with unpredictable results, which itself resulted in a strong online following and lots of sequels. You could think of it as a precursor to Spore.
But the only review on Eurogamer is for Creatures 3, and it's not exactly a recommendation at 2/10.
GOG.com has also added golden oldie Beyond Divinity as it said it would when announcing the release of Divine Divinity a couple of weeks ago.