I use ReStructuredText mostly. Files start out as plain text and slowly grow more markup as they progress. Easy enough to read in plain text ... then can be t

I use ReStructuredText mostly. Files start out as plain text and slowly grow more markup as they progress. Easy enough to read in plain text ... then can be thrown through rst2pdf to hand over to clients as "the documentation". Not pretty, but compared to the nightmare of keeping .odt docs up to date across branches and merges ...