FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux

MathType - The Professional version of Equation Editor- MathType is a powerful interactive tool for Windows and Macintosh that lets you create mathematical notation for word processing, web pages, desktop publishing, presentations, and for TeX, LaTeX, and Math…

Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...

Math Magic - MathMagic Equation Editor for Desktop Publishing software & Word Processors, Adobe InDesign, QuarkXPress, MS Word, iWork, for Technical writing with very easy interface and fast input.

BirdFont - Birdfont is a free font editor which lets you create vector graphics and export TTF, OTF, EOT and...

MathCast - MathCast is an equation editor, an application that allows you to input mathematical equations.