FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
PhraseExpress - PhraseExpress is one of the best and most fully featured text expansion apps available to Windows users.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Beeftext - Beeftext is an open-source text substitution tool for Windows.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
TextExpander - TextExpander: Communicate Smarter. Gather, Perfect, Share Your Knowledge. Recall your best words instantly, repeatedly.