| API | Description | Category | Date |
|---|---|---|---|
| TagTooga | Tag based Internet directory | Tagging | 2006-04-26 |
| Tagyu | Tag recommendation service | Tagging | 2005-10-29 |
| Topicalizer | Document analysis service | Other | 2006-03-23 |
| Trails.by | Q&A social bookmarking tool | Bookmarks | 2012-05-29 |
| UMBEL | Semantic structure service | Reference | 2010-11-10 |
| Wikimeta | Semantic tagging and content annotation service | Reference | 2012-02-14 |
| Zemanta | Blog authoring extension services | Blogging | 2008-07-20 |





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