| API | Description | Category | Date |
|---|---|---|---|
| 43 Places | Social travel goals | Social | 2008-07-02 |
| 43Things | Social goal setting | Goal Setting | 2005-10-30 |
| Amplify | Content analysis service | Internet | 2009-05-08 |
| Evri | Recommendations and semantic search service | Recommendations | 2008-12-14 |
| GroupMe | Social bookmarking | Bookmarks | 2007-12-25 |
| 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 |
| Reflect | Biology and chemical tagging service | Tagging | 2010-12-29 |
| Saplo Text Analysis | Text Analysis Tool | Tools | 2010-12-14 |
| Steve In Action | Museum social tagging project | Tagging | 2010-12-16 |
| Tagalag | Email tagging | Tagging | 2005-10-05 |
| Tagatum | Blog tags repository services | Tagging | 2008-08-28 |
| TagFinder | Tag extraction service | Tagging | 2006-03-29 |
| Taglets | Tagging service | Tagging | 2009-02-28 |
| tagthe.net | Tag recommendation service | Tagging | 2006-07-03 |
| TagTooga | Tag based Internet directory | Tagging | 2006-04-26 |
| Tagul | Tag Cloud Creation Service | Tagging | 2011-04-01 |
| Tagyu | Tag recommendation service | Tagging | 2005-10-29 |
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