LaTeX Equation Editor – Equation Maths
Writing Mathematics on the Internet. Witing equations is difficult in a doc, they have to be font independent, that implies images. Webapps do it well.
LyX combines the power and flexibility of TeX/LaTeX with the ease of use of a graphical interface. This results in world-class support for creation of mathematical content (via a fully integrated equation editor) and structured documents like academic articles, theses, and books.
Also try AbiWord a free word processing program. Excellent for a wide variety of word processing tasks. Has MathML and LaTex input.