STX (Structured Text)
Structured Text (aka. STX) is a simple markup technique that is useful when you don't want to resort to HTML for creating web content. It uses indenting for structure, and other markup for formatting. Has been superceded by reStructuredText, but a lot of people still prefer the old version, as it's easier to learn and more suited to simple documents. More information in the How-to section of plone.org.