SSAlphaPass
April 14, 2015 • MIT License
Pass on touch events to the UIView \ UIButton underneath your current view if your pixel alpha channel is 0 (if the pixel is transparent)
Useful if you don't want to catch all touch events on UI...
Alpha Channel Remover
October 09, 2014 • Public Domain License
Mac OS X Application which allow users to remove alpha (transparency) from images. You can remove alpha channel of multiple files within seconds.