- OPML Editor Support
 - Documents and support for OPML Editor. - OPML Search
- Search engine for OPML files.
- OPML Workstation
- Web-based integrated service for creating, hosting, and publishing OPML files.
- OPML.org
- OPML technical details, editor, validator, and more.
- Opmlmanager.com
- Online webservice to help maintain user's opml-file.
- Share Your OPML
- A commons for sharing outlines, feeds, and taxonomy.
- Wikipedia: OPML
- Article about OPML, describing its XML format, shortcomings, example documents, and more.
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