Unity is a cross-platform game engine with a built-in IDE developed by Unity Technologies. It is used to develop for web plugins, desktop platforms, consoles and mobile devices. It grew from an OS X supported game development tool in 2005 to a multi-platform game engine.
Unity released the full version of its PlayStation Mobile engine build, meaning that Unity developers can now release games for the PS Vita for free. This news can be a very vital news for fellow indie developers and fellow unity developers to deploy their product on the PlayStation mobile. For almost 4 months now, the buzz has been around that Unity would release the full version of the PlayStation mobile engine build and that developers can be able to release games for the PS vita for free in a short time.
Any Unity developer can now simply register for free with Sony Computer Entertainment, then deploy their PS Mobile games for the PS Vita. If you’re looking to release your game as a full PS Vita game, rather than a PS Mobile game, you’ll still need to talk to Sony about that.
Source: Unity Blog