| API | Description | Category | Date |
|---|---|---|---|
| Amplify | Content analysis service | Internet | 2009-05-08 |
| Derpibooru | My Little Pony photo sharing service | Photos | 2012-08-13 |
| Evri | Recommendations and semantic search service | Recommendations | 2008-12-14 |
| OCLC Virtual International Authority File | Library authority file service | Tagging | 2011-11-01 |
| OpenDover | Semantic tagging webservice | Tagging | 2010-10-27 |
| Quora | Question and answer site | Answers | 2011-01-10 |
| Qwips | Social voice-tagging service | Social | 2011-09-27 |
| reegle | Green Energy and Climate Tagging Service | Tagging | 2012-12-17 |
| Saplo Text Analysis | Text Analysis Tool | Tools | 2010-12-14 |
| SimilarWeb Website Tagging | Website content tagging service | Internet | 2013-02-26 |
| Steve In Action | Museum social tagging project | Tagging | 2010-12-16 |
| Taggstar | Photo enhancement application | Photos | 2012-09-28 |
| tagthe.net | Tag recommendation service | Tagging | 2006-07-03 |
| Trails.by | Q&A social bookmarking tool | Bookmarks | 2012-05-29 |
| Wikimeta | Semantic tagging and content annotation service | Reference | 2012-02-14 |
| Zemanta | Blog authoring extension services | Blogging | 2008-07-20 |





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