| API | Description | Category | Date |
|---|---|---|---|
| Quora | Question and answer site | Answers | 2011-01-10 |
| Zemanta | Blog authoring extension services | Blogging | 2008-07-20 |
| GroupMe | Social bookmarking | Bookmarks | 2007-12-25 |
| Trails.by | Q&A social bookmarking tool | Bookmarks | 2012-05-29 |
| 43Things | Social goal setting | Goal Setting | 2005-10-30 |
| Amplify | Content analysis service | Internet | 2009-05-08 |
| SimilarWeb Website Tagging | Website content tagging service | Internet | 2013-02-26 |
| Barbershop Tags | Barbershop music sharing and user community service | Music | 2012-08-20 |
| Topicalizer | Document analysis service | Other | 2006-03-23 |
| Derpibooru | My Little Pony photo sharing service | Photos | 2012-08-13 |
| Evri | Recommendations and semantic search service | Recommendations | 2008-12-14 |
| UMBEL | Semantic structure service | Reference | 2010-11-10 |
| Wikimeta | Semantic tagging and content annotation service | Reference | 2012-02-14 |
| Sem4Tags | Semantic tagging interpretation service | Reference | 2012-06-13 |
| Sapo Tags | Tag search service | Search | 2012-05-04 |
| 43 Places | Social travel goals | Social | 2008-07-02 |
| Tagyu | Tag recommendation service | Tagging | 2005-10-29 |
| tagthe.net | Tag recommendation service | Tagging | 2006-07-03 |
| TagFinder | Tag extraction service | Tagging | 2006-03-29 |
| Tagatum | Blog tags repository services | Tagging | 2008-08-28 |





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