| API | Description | Category | Mashups |
|---|---|---|---|
| MusicBrainz | Music metadata community service | Music | 35 |
| Calais | Semantic data search and extraction service | Other | 17 |
| DBpedia | Structured query interface to Wikipedia | Wiki | 16 |
| ClearForest Semantic Web Services1 | Natural language processing tools | News | 12 |
| Evri | Recommendations and semantic search service | Recommendations | 9 |
| GetGlue | Social networking for entertainment service | Social | 8 |
| True Knowledge | General question and answers service | Search | 6 |
| Zemanta | Blog authoring extension services | Blogging | 6 |
| WebKnox | Entity and fact extraction tool | Tools | 5 |
| Sensebot | Semantic search service | Search | 3 |
| Yolink | Semantic search | Search | 3 |
| Alchemy | Semantic text and data dection and extraction | Tools | 2 |
| Amplify | Content analysis service | Internet | 2 |
| SemanticHacker | Semantic discovery service | Search | 2 |
| Wolfram Alpha | Computational knowledge and search engine | Reference | 2 |
| Yahoo Geo Location | Geolocation service for words and phrases | Mapping | 2 |
| AlchemyAPI Keyword and Term Extraction | Text analysis and extraction tool | Utility | 1 |
| AlchemyAPI Text Categorization | Text analysis and categorization tool | Tools | 1 |
| BeliefNetworks | Semantic Intelligence, Site recommendations service | Recommendations | 1 |
| Data.gov.uk | Public government database | Government | 1 |
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