The Gonta project contains usefull classes for Flash/Flex/AIR development.

Filters Package

WetFloorFilter

Creates a reflection of specified DisplayObject. You can set alpha, height and start position of reflection. The main useful feature of this filter is that reflection can be outside of the result image, this filter based on PixelBender shader.

Graphics Package

MarchingAntsStroke

Create "Marching Ants" marquee for selection, perfect for rectangular selections.