Fast Markdown libraries for Ruby: two for the price of one.
RDiscount, a fast Markdown library for Ruby, is now included with the FreeBSD ports collection thanks to Daniel Roethlisberger.
Interesting Rails plugin from Viget Labs that adds ActiveRecord attribute helpers for various humane markup languages. The markdown variation supports both rdiscount and rpegmarkdown. Cool. Not sure how I missed it when it was released in August.
Compare (as in, diffs) the output of 15 different Markdown implementations. Includes every Markdown implementation I've ever come across and then some…
An implementation of Markdown in portable ANSI C that’s roughly 28.5x faster than the canonical Perl implementation on a 179K test file. Looks like a complete implementation; includes smarty and footnote extensions.
This looks promising: handles all of Markdown proper plus various extensions.