https://kotaku.com/5521625/your-first-look-at-steam-running-on-a-mac
Finally, we, mac owners will be able to game properly on them.
If some admin reads this, please eliminate this thread. It seems the other thread created before this one doesn’t include the word “mac” in it’s title, that’s why when I searched for “Steam Mac” I didn’t find anything. Sorry, won’t happen again
Valve is providing the platform but it’s up to the game companies to port the games.
Yeah, apart from valve games that will be ported by them. This includes Portal, Half-Life 2 and its episodes, Team Fortress 2 and Left 4 dead. 
Mac owners, game properly???
You make me lol.
Of course I have a terrible graphics card so I’m just hoping I can barely scrape by. BTW, will Source SDK be ported?
From now on, the sdk and every source game, even the old ones will run natively in a steam client for both microshaft and crapple. All new valve games will be released simultaneously for OSX, windows and the sex box. There is a linux client on the way.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.