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…
NumWorks - The graphing calculator that makes learning math easier.
Equation Illustrator V - Technical graphic tool for Windows to format and align formulae.
Learney - Knowledge aggregator for developers
WIRIS editor - WIRIS editor is a visual editor (WYSIWYG) that allows inserting mathematical formulas in web pages.
eMathHelp.net - Site is created to help people learn math. Includes algebra, calculus, differential equation calculators and notes with many examples.