Marvel for iOS - Rapid design and prototyping for the iPhone and iPad
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Peetch - The last PowerPoint Pitchdeck you’ll ever need
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
Keynotopia - Prototyping straight into Keynote or Powerpoint
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...