PlaneShift 0.7.43 for Mac can be downloaded from our website for free. This free software for Mac OS X is an intellectual property of Atomic Blue. The software lies within Games, more precisely Adventure.
From the developer:
The objective of PlaneShift is to create a virtual fantasy world in which a player can start as a peasant in search of fame and become a hero. We will focus our efforts in the reproduction of a real world with politics, economy and many non-player-characters controlled by the server that will bring to life our world even without players connected!
You may want to check out more Mac applications, such as Tradewinds Caravans, Ancient Adventures - Gift of Zeus or Jolly Rover Demo, which might be similar to PlaneShift.