jemdoc is a light text-based markup language designed for creating websites. It takes a text file written with jemdoc markup, an optional configuration file and an optional menu file, and makes static websites that look something like this one, that one or another one.
jemdoc was inspired by AsciiDoc, which is a text document format. AsciiDoc is great, and lots of the ideas from AsciiDoc are copied in jemdoc. The main differences are that jemdoc is simpler (you could say deliberately feature poor) and has more consistent syntax.