If you have $29.99 (USD; normally $39.99) you can pick up 32 classic 3D Realms games from Steam in the 3D Realms Anthology.
Come get some! The 3D Realms Anthology is now available on Steam for PC and Mac for a limited-time price of $29.99, normally $39.99. The collection contains 32 revolutionary games, which -- if purchased individually -- would run more than $120. Here's the list:
Alien Carnage / Halloween Harry
Arctic Adventure
Balls of Steel
Bio Menace
Blake Stone: Aliens of Gold
Blake Stone: Planet Strike
Cosmo's Cosmic Adventure
Crystal Caves
Dark Ages
Death Rally
Duke Nukem
Duke Nukem 2
Duke Nukem 3D
Duke Nukem: Manhattan Project
Hocus Pocus
Major Stryker
Math Rescue
Monster Bash
Monuments of Mars
Mystic Towers
Paganitzu
Pharaoh's Tomb
Raptor: Call of the Shadows
Realms of Chaos
Rise of the Triad: Dark War
Secret Agent
Shadow Warrior (Classic)
Stargunner
Terminal Velocity
Wacky Wheels
Word Rescue
Xenophage
Alien Carnage / Halloween Harry
Arctic Adventure
Balls of Steel
Bio Menace
Blake Stone: Aliens of Gold
Blake Stone: Planet Strike
Cosmo's Cosmic Adventure
Crystal Caves
Dark Ages
Death Rally
Duke Nukem
Duke Nukem 2
Duke Nukem 3D
Duke Nukem: Manhattan Project
Hocus Pocus
Major Stryker
Math Rescue
Monster Bash
Monuments of Mars
Mystic Towers
Paganitzu
Pharaoh's Tomb
Raptor: Call of the Shadows
Realms of Chaos
Rise of the Triad: Dark War
Secret Agent
Shadow Warrior (Classic)
Stargunner
Terminal Velocity
Wacky Wheels
Word Rescue
Xenophage