Download Unity for Mac or Windows right now...for free! Just visit www.unity3d.com and click download to get started.
The free version of Unity offers a full professional suite of rendering power and tools to craft any kind of game and other rich interactive content. An extensive arsenal of high-end graphics, special effects, audio, lighting, physics and performance optimization tools is available to keep great-looking content running smoothly on any hardware.
Unity comes with Web and desktop platform support. Mobile games and content can be deployed with additional Unity mobile add-ons.