FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Future Me - Send an email to your future self
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
Letter to Yourself - Send a physical letter to your future self