Documentation - which format

I'm considering using plain text file for documenting certain things (nothing
to do with Python) and I'm looking at different "formatting systems" ...
preferable with a python implementation to render the text at least as HTML -
preferable also other formats like LaTeX.

So far I've found

+ Markdown
+ reST (the web site at sourceforge doesn't seem to have been updated
since 2006)

Are there any other I should look at?