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This question already has an answer here:

Was wondering which of the numerous WMD editors is used on SO? When I Google SO and WMD Editor there are several results linking to several different forks, what I've found so far are:

Side-note, most of the questions related to this topic, on MSO, date back to 2008-2010.

Some clarification would be great. Thanks.

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marked as duplicate by Jarrod Dixon Jun 12 '13 at 19:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

@TimStone: Ahhh my bad, didn't see that when I was digging around. Thanks. – Mike Purcell Feb 11 '12 at 1:37
up vote 15 down vote accepted

I can't claim to be an authority on this subject, but the tag wiki has the following to say.

This editor is open source.

On the server it is MarkdownSharp:

On the client it is PageDown:

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Thanks Chris, I was thinking PageDown as well due to the recent update activity, but would like to be sure. I'm going to hold off on accepting to see if I can get an "official" word. – Mike Purcell Feb 11 '12 at 1:23
@DigitalPrecision Sounds good. For what it's worth, it also looks like Jeff added this information in September 2011. – Chris Frederick Feb 11 '12 at 1:25
@DigitalPrecision Not that my word is necessarily any more official than Chris', but PageDown is indeed the official project that's being maintained and used on the Stack Exchange network. – Tim Stone Feb 11 '12 at 1:31
Ahhh that's good enough for me then. Thanks for the help guys. Pagedown it is. – Mike Purcell Feb 11 '12 at 1:35
What is MarkdownSharp used for? Pagedown includes the validation and everything you need, no? – llamawithabowlcut Dec 30 '14 at 21:44
It seems the stack exchange github page has changed and pagedown is now on github here: balpha/pagedown – Uftou La Touffe Dec 23 '15 at 19:09

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