Crossfont - Easy-to-use font editor for Mac
Marvel (mobile) - Turn sketches into prototypes (new iOS & Android apps)
BitFontMaker2™ - Fast and easy Online Bitmap font Editor.
Gomix - The easiest way to build the app or bot of your dreams
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Mockup Generator - Create attractive product screenshots with just a few clicks