Omikron: The Nomad Soul is a—what, exactly? An RPG? An FPS? An adventure? I don't think it matters, because David Bowie is in it and that pretty much defies description in itself. A late 1999 game by a younger David Cage and his Quantic Dream studio before it moved on to bad-parenting simulators on consoles, Omikron is a story about a futuristic cybercity and its mysteries. And David Bowie. It's on GOG now for $10.
Quantic Dream's flawed, experimental adventure, Fahrenheit, is now available on Good Old Games for $6. If you missed it when it came out six years ago (easy to do in the US, where an edited, sex-free version came out under the nonsense name Indigo Prophecy), it's still worth playing for the novelty of its effective first two acts.
Ultimately, Fahrenheit jumps the rails so hard that even its awful third act plotting is worth a playthrough. When a second conspiracy faction emerges from the shadows of what can only have been an epic case of writer's block, and introduces itself as an evil sentient computer network born out of Usenet, you know you are in the presence of a true original.
That said, there is a lot I still admire about this game.