The OS X and Linux editions of ARK: Survival Evolved are now available on Steam along with the Windows edition of the Early Access dinosaur infested survival game. All three editions support cross-platform multiplayer support, and as they explain here, they are celebrating with a sale:

Today we are pleased to announce that the open-world adventure game ARK Survival Evolved is now available for Mac and Linux on Steam Early Access, among the first large-scale Unreal Engine 4 game released for these two platforms!

The Mac and Linux versions share all of the features and content of the PC game and includes seamless online cross-play, with players able to play together no matter which platform they choose.

ARK survivors can dive into the dynamic ecosystem where they craft weapons and tools, build multi-story houses, commune with other tribes, as well as tame, train and ride a huge variety of dinosaurs from the terrifying T-Rex to the monstrous Spinosaurus and the soaring Pteranodons.

In celebration of the new launch and to welcome our new players, ARK is on sale at the discounted price of $24.89 on all platforms!