After a time in beta Terraria officially comes to Mac & Linux to much joy. I've been playing it on my Mac and Fedora Linux machine and it works incredibly well. The Steam cross saves really make the experience really seamless. I consider Terraria a national treasure so it's good to see that anyone can play it on any of the major PC platforms.

"Mac and Linux Terrarians, your day has finally arrived!

We here at Re-Logic are thrilled to announce that we are officially launching the Mac & Linux versions of Terraria today! This has been a very long time in coming - and we know how very much the Community has desired these new Terraria platforms, so we are eagerly looking forward to hearing your reaction. :)

For everyone, please note that this will be Terraria 1.3.0.8. This version ensures compatibility between Mac/Linux and Windows - no other substantial changes come with this update."

http://forums.terraria.org/index.php?threads/terraria-1-3-0-8-can-mac-linux-come-out-play.30287/