API Tag Search: reference
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| API | Description | Category | Date |
|---|---|---|---|
| Abbreviations | Abbreviated words services | Reference | 2008-08-26 |
| Aonaware Dictionary | Dictionary lookup service | Reference | 2006-11-19 |
| arXiv | Academic research repository | Reference | 2008-05-04 |
| Baby Names | International baby naming services | Other | 2008-07-20 |
| Big Huge Thesaurus | Thesaurus lookup services | Reference | 2008-08-28 |
| CatalogWS | Academic library | Reference | 2008-02-07 |
| City and State by Zip Code | Address lookup service | Reference | 2006-11-19 |
| Comprehensive Knowledge Archive Network | Community driven open knowledge database | Reference | 2008-07-10 |
| Cortera | Business information and research data | Reference | 2008-05-01 |
| Cortera Business Vitals | Basic company information web service | Reference | 2008-05-11 |
| CrunchBase | Directory of companies, people, and investors | Reference | 2008-07-16 |
| DBpedia | Structured query interface to Wikipedia | Wiki | 2007-08-08 |
| Dun and Bradstreet Business Verification | Research company background data | Reference | 2006-09-23 |
| Dun and Bradstreet Credit Check | Credit quick check web service | Financial | 2006-12-13 |
| Dun and Bradstreet WorldBase Marketing Plus | Business research services | Reference | 2006-09-23 |
| DuoShare Address Verification | US address verification service | Reference | 2008-09-21 |
| Email Address Validator | Email address validation service | 2006-11-11 | |
| Freebase | Community driven open database | Database | 2007-10-13 |
| FUTEF Wikipedia API | Third party Wikipedia web service | Reference | 2007-01-23 |
| Goodreads | Book search and social book services | Other | 2008-10-09 |
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