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StackEdit – An In-Browser Markdown Editor for Professionals

You might not have heard about PageDown before, but you must have heard about Stack Overflow and its sister sites. Well, PageDown is the Markdown library those services use. And it is also what StackEdit is based on.

StackEdit is a full-featured modern, open-source Markdown editor and it is what is used by Stack Overflow and all its sibling sites.