Reduce PDF Size - Reduce PDF Size a free PDF document compression app.

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…

Zamzar - Free conversion online of many type of documents (images, text, video, audio...

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.

PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available

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