Unity is a game development ecosystem: a powerful rendering engine fully integrated with a complete set of intuitive tools and rapid workflows to create interactive 3D and 2D content; easy multiplatform publishing; thousands of quality, ready-made assets in the Asset Store and a knowledge-sharing community.

For independent developers and studios, Unity’s democratizing ecosystem smashes the time and cost barriers to creating uniquely beautiful games. They are using Unity to build a livelihood doing what they love: creating games that hook and delight players on any platform.

Workflow
Rapidly assemble your scenes in an intuitive, extensible Editor workspace. Play, test and edit for fast iteration towards your finished game.

Quality
Create a game with AAA visual fidelity, audio and full-throttle action that performs smooth and clean on any screen.

2D & 3D
Get dedicated tools for both 2D and 3D content creation with efficient workflows that utilize shared conventions.

Mecanim
Unity’s uniquely powerful and flexible animation system brings any character or object to life with incredibly natural and fluid movement.

Performance
Reliable performance, smooth framerate, and superb game play experiences across target platforms.

Multiplatform
No other game engine gives you the choice of so many publishing platforms with near-effortless deployment.

Collaboration
Full version control for all game assets; instantly grab changes from other team members, and extend Unity for generic VCS support.

Home Page - http://unity3d.com/