Eqe is a simple clone of the excellent LaTeX equation editor you can find on MacOS X. There's a zone to type LaTeX input, and it generates an image to represent it (color, font, and size are customisable). You can drag the image to other applications (like OpenOffice.org Impress, Mozilla, the Gimp). It also exports to almost any image format, including PNG, JPEG, PDF...). It is free software, released under the GPL. It is composed of two parts: eqedit, which is a command line tool that generates images from LaTeX input, and eqe which wraps eqedit into a graphical user interface.