An Uber Shader specialised in rendering Alpha Blended objects like sprites.
It supports lots of features including:

Normal Mapping
Specular Mapping
Emission Mapping
Mulitple Blend Modes
Hue/Saturation color adjustment
Rim Lighting
Fog
Shadows
View-space normals (for more realistic lighting without the need for vertex normals)
Optional Depth writing
Both Pixel AND vertex lighting supported.

It has a nifty Shader GUI meaning its very easy to use. It's also modular so features you don't use don't impact performance at all.
Because all the features are usable in a single render pass (using vertex lighting) it works really well with skeleon based animations or sprites with submeshes (eg Spine animations).

Full read me and more info here!