this is very good summary of what's out there.<p>the categories seem to be a bit mixed up, but
i don't see very much stuff that is missing --
considering the difficulty of being exhaustive
-- except for three large and notable exceptions.<p>the first one is "multimarkdown composer",
which is found at <a href="http://multimarkdown.com" rel="nofollow">http://multimarkdown.com</a>.<p>next, "strapdown", at <a href="http://strapdownjs.com" rel="nofollow">http://strapdownjs.com</a>.<p>finally, "marky", at <a href="http://markdownrules.com" rel="nofollow">http://markdownrules.com</a>.<p>-bowerbird