The docgenerator-gem create documents with export feature as LaTeX, HTML, Creole (a common wiki markup, see http://www.wikicreole.org ), conTeXt (only rudimentory), plain text (not very good supported) and Wiki-markup like Wikimedia (no support any longer). A Creole-parser is part of the dirstribution.
Runtime Dependencies (1):
A (La)TeX-system if used as TeX-generator (in fact, you can create TeX-Files, but without a TeX-System you will have no fun with it ;-))
rake4latex-gem >=0.1.0 may be usefull.