• Manna Cabanna - Uses the Open Directory's society category with Thumbshots.
• ManofKnowledge - A copy of the Open Directory taken from the RDF dump, with advertising supplied by Google.
• Mars Open Directory - The "Mars" section of the Open Directory Project, maintained by the MarsNews.com. Gateway.
• Master.com portal - A demonstration from master.com of the search and directory it offers to webmasters, using the Open Directory data.
• Melton Enterprises - This Melbourne store includes a directory of Australian cricket taken from the ODP.
• Messagetalk - Portal uses ODP directory with Thumbshots.
• MetaDirectorio - Uses ODP directory with Thumbshots.
• Metasearch - Offering a combination search engine and directory based on ODP data.
• Metrónimo - Music site uses ODP directory with Thumbshots and powered by PHPODP.
• Mike's Community - Forum, news and diary of events on Scottish ceilidh and salsa. Includes a directory based on the ODP.
• Milliseconde Portal - Directory using ODP data.
• Mirago - UK search engine with main directory drawn from ODP Regional: Europe: United Kingdom supplemented with listings from Mirago. Also offers the complete ODP.
• MrEverything - Web portal with search, directory using the ODP, real estate, shopping, news, finance, stock quotes, recipes, indoor air quality information, travel.
• MusicMoz - A music directory, edited by volunteers. Lists and accepts submissions of music-related websites, reviews, and artist and recording information.
• Myfreebulletinboard - Uses ODP directory powered by PHPODP.

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