FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Zeplin - Collaboration app for UI designers & frontend developers
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
Abstract - A secure, version-controlled hub for your design files