Awesome

GPUI - Stage3D based UI

Core ideas:

• make it as tiny and simple as possible
• make it single call render

yes the whole UI set is single batch ;) and rendered via single drawTriangles... that's probably not very smart but fun! there is no dynamic text support, i mean u only have labels, and labels are rendered as textures. lame but fast and uses only one Texture for whole UI set! fun! ;)

Very basic style system:

u can define default TextFormat to use for labels and several color options like bgColor darkColor lightColor textColor and thats it... fun! ;) ahh yes and u can use roundedCorners with specified radius :) or dont use...

GPUGUIStyle.setStyle(
                     darkColor:uint, lightColor:uint, bgColor:uint, // default color theme
                     textFormat:TextFormat = null, // define text font and size
                     embedFonts:Boolean = true, // if font is embedded
                     textAntiAlis:String = AntiAliasType.NORMAL, // font alias type
                     textColor:uint = 0xFFFFFFFF, // label color
                     paddX:Number = 3, paddY:Number = 3, // padding between controls
                     controlWidth:Number = 200, controlHeight:Number = 30, // default controls size
                     controlCornerRadius:Number = 0.0 // shapes corner radius
                     ):void;

well i was creating it for my personal needs and wasn't thinking about sharing the result since it is too small and maybe unusable for real world problems. but i think it is quite useful for quick tests because u can setup it on top of your own Stage3D stuff without including any other frameworks...

Handle events and getting results

control.setCallBack(onCallBack);
function onCallback(...args):void
{
    // u shoulc check specific component what arguments it returns
    // for example GPUGUIColor returns 5 arguments
    // color:uint, red:Number, green:Number, blue:Number, alpha:Number
}

//
// u can also assing properties directly to your objects
//
control.setTarget(target:*, property:String):void

// so when controls value changed it will set
target.property = newValue;

Few Screens to get the feeling