FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Grammarly - Clear, effective, mistake-free writing everywhere you type.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
WhiteSmoke - WhiteSmoke software products for writing and language. WhiteSmoke is a grammar checker, spell checker, style checker and more - in a single package. Also featuring translation software and English video courses.