LibreOffice - Math - Math, LibreOffice, math editor, ODF, OpenFormula, open standards
MalMath - MalMath is a great deal more than a mini-computer.
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.
WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
KLatexFormula - KLatexFormula is an easy-to-use graphical application for generating images (that you can drag and...
TexMaths - TexMaths is an addon designed to provide LaTeX support into LibreOffice.