A rundown of the features of the BBSprite plugin.
A plugin for Unity 3D to make it easy to create and script billboarded sprites or "Z-sprites". The spritesheet is assigned as any other texture in Unity (drag and drop). Its layout is auto-detected correctly most of the time. Animations are simply a list of cell indices.
In the interest of making this plugin as intuitive as possible, I had to dig into Unity3D beyond the documentation. A few hacks were required in the name of intuitive UI.