Unity 2.5

The only Mac-based, high-end game development tool sporting a stylish pro-app GUI, no-friction workflow and top-of-the-line technical features. Features include extensible graphics and full-screen effects, great particle effects, highly optimized scripting, the Ageia physX Engine, skinned character animation and ragdolls, and extensible editor. Make standalone games for Mac and Windows (and Dashboard widgets and web plug-ins too).
Unity is a 3D game editor which happens to contain one of the most advanced game engines out there. Packed with power it is built to meet the demands of next-generation game developers.
Create dazzling, different, captivating games with state of the art technology such as the Ageia physX Physics Engine, the most modern graphical effects, and highly optimized JavaScript. Many more features.