Valve has just released popular source-code physics simulator/sandbox editor Garry’s Mod for Mac OS X users. The title utilizes assets from Half Life 2 and other Valve games and allows its users to create pretty much whatever they want using the tools provided. While this is not really a game and more of a simulator/editor, it’s pretty impressive what many users have been able to do using Garry’s Mod. Perhaps what its best known for is its Rude Goldberg inspired creations, like the user created video embedded below.

Garry’s Mod for Mac is available for free if you have already purchased the PC version, otherwise will cost you $4.99, which is a 50% discount off the regular price. You can grab the title now via Steam.

[Valve via TUAW]