FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
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
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
ActiveWords - Auto correct on steroids