MWeb can handle professional-level markdown with support for markdown extensions. It provides publishing to various social networks and blogging formats, as well as various preview themes. It also has two work modes: external, which allows the addition of external folders; and library, designed for note-taking and static blogging.
Requirements: OS X 10.9 or later Home Page - http://www.mweb.im/ Features
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TO WIN USERS: If RAR password doesn't work, use this archive program:
Latest Winrar and extract password protected files without error.