LibreOffice - Math - Math, LibreOffice, math editor, ODF, OpenFormula, open standards
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
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.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
KLatexFormula - KLatexFormula is an easy-to-use graphical application for generating images (that you can drag and...
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.