Steam For Mac Is Live, Includes Free Copy of Portal

Valve Software has flipped the switch. You can now officially download Steam for Mac OS X. Do so now and Valve will throw in a copy of the original Portal for free.

The first-person puzzle hit can be yours for zero dollars or zero Valve Points until May 24, when Portal returns to its regular price. We’d say that’s motivation enough to download Steam for Mac, but you may say differently. And you’d be wrong. Update: Portal is also currently free to Steam users on Windows!

Portal is the only Valve developed game available right now, sadly, but other developers including LucasArts and Telltale help to make up for the slim pickings. A full list of what’s available for the Mac is available at the official Steam web site, along with a handy link to download the OS X version of Valve’s digital distribution platform.

A long list of currently available games is also below, with Valve promising new games “highlighting an area of Steam functionality” every Wednesday. The following games are all Steam Play releases, meaning that you can purchase a title on one Steam platform, say Windows, and play it on another, like Mac OS X.

And Yet It Moves

Atlantis Sky Patrol

Bejeweled 2 Deluxe

Bob Came in Pieces

Bookworm Deluxe

Braid

Brainpipe

Chocolatier: Decadence by Design

Chuzzle Deluxe

City of Heroes: Architect Edition

Civilization IV: The Complete Edition

Cooking Dash

Diaper Dash

The Dig

Diner Dash: Hometown Hero

DinerTown Detective Agency

DinerTown Tycoon

Dream Chronicles: The Chosen Child

Escape Rosecliff Island

Fairway Solitaire

Fitness Dash

Football Manager 10

Galcon Fusion

Gemini Lost

Guns of Icarus

Hotel Dash Suite Success

Indiana Jones and the Fate of Atlantis

Indiana Jones and the Last Crusade

KrissX

Loom

Luxor

Luxor 3

Luxor: Mahjong

Machinarium

Mahjong Roadshow

Max and the Magic Marker

My Tribe

The Nightshift Code

Nightshift Legacy: The Jaguar’s Eye

Parking Dash

Peggle Deluxe

Peggle Nights

Portal

Professor Fizzwizzle and the Molten Mystery

Quantz

Sam & Max: The Devil’s Playhouse

Tales of Monkey Island Season 1

Toki Tori

Torchlight

Trijinx: A Kristine Kross Mystery

Unwell Mel

Valarie Porter and the Scarlett Scandal

Wandering Willows

Wedding Dash 2: Rings Around the World

World of Goo

Zenerchi

Zuma Deluxe