Gitit is a wiki backed by a git, darcs, or mercurial filestore. Pages and uploaded files can be modified either directly via the VCS’s command-line tools or through the wiki’s web interface. Pandoc is used for markup processing, so pages may be written in (extended) markdown, reStructuredText, LaTeX, HTML, or literate Haskell, and exported in ten different formats, including LaTeX, ConTeXt, DocBook, RTF, OpenOffice ODT, and MediaWiki markup.

Bear CSS is a handy little tool for web designers. It generates a CSS template containing all the HTML elements, classes & IDs defined in your markup.

Fountain allows you to write screenplays in any text editor on any device. Because it’s just text, it’s portable and future-proof.

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A ReStructuredText Primer (HTML file, or text source).
Quick reStructuredText (user reference