I love ; it nicely fills a niche created by my interests in free/open source software, statistics, and design/aesthetics. The results are simply amazing. I've used it for non-technical document typesetting, statistics homework, and typesetting equations.
editors I use:
- with the Gedit Plugin
- Notepad++ (the PortableApps.com version) is one I bring along to use when on a public computer.
Some other stuff related to that I use:
- The R Project for Statistical Computing + Sweave for statistics
- Tomboy with the plugin for note-taking and personal wiki
Types of equations I've used for:
- General mathematics (algebra, calculus)
- Actuarial formulas
- Word equations (like financial ratios)