LibreOffice - Math - Math, LibreOffice, math editor, ODF, OpenFormula, open standards
Dabble Writer - Writing software for novelists.
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.
SHAXPIR - A modern cloud workspace for fiction writing & worldbuilding
KLatexFormula - KLatexFormula is an easy-to-use graphical application for generating images (that you can drag and...
Manuskript - Open-source tool for writers.