| API | Description | Category | Date |
|---|---|---|---|
| SimilarWeb Website Tagging | Website content tagging service | Internet | 2013-02-26 |
| MyTagList | Device monitoring service | Tagging | 2013-02-08 |
| reegle | Green Energy and Climate Tagging Service | Tagging | 2012-12-17 |
| Ontos | Semantic data for content | Tagging | 2012-10-18 |
| Taggstar | Photo enhancement application | Photos | 2012-09-28 |
| Barbershop Tags | Barbershop music sharing and user community service | Music | 2012-08-20 |
| Derpibooru | My Little Pony photo sharing service | Photos | 2012-08-13 |
| Sem4Tags | Semantic tagging interpretation service | Reference | 2012-06-13 |
| Joey Calca's Post to Facebook | One-time Facebook Wall post application | Tagging | 2012-06-06 |
| Trails.by | Q&A social bookmarking tool | Bookmarks | 2012-05-29 |
| Sapo Tags | Tag search service | Search | 2012-05-04 |
| Jinni | Movie discovery and search service | Search | 2012-03-26 |
| Wikimeta | Semantic tagging and content annotation service | Reference | 2012-02-14 |
| OCLC Virtual International Authority File | Library authority file service | Tagging | 2011-11-01 |
| Qwips | Social voice-tagging service | Social | 2011-09-27 |
| Tagul | Tag Cloud Creation Service | Tagging | 2011-04-01 |
| Quora | Question and answer site | Answers | 2011-01-10 |
| Reflect | Biology and chemical tagging service | Tagging | 2010-12-29 |
| Steve In Action | Museum social tagging project | Tagging | 2010-12-16 |
| Saplo Text Analysis | Text Analysis Tool | Tools | 2010-12-14 |
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