| API | Description | Category | Date |
|---|---|---|---|
| Cambridge Journals Online | Cambridge University Press collections | Reference | 2013-05-16 |
| National Library of Medicine Digital Collections | Library of medical books and video | Medical | 2013-05-13 |
| Digital Public Library of America | National digital library | Reference | 2013-05-09 |
| Harvard Dash | Digital repository of scholarly articles | Education | 2013-05-07 |
| eLife | Biological sciences journal access service | Science | 2013-05-02 |
| Styfee | Internalization and localization services | Reference | 2013-05-02 |
| Collins Dictionary | Online dictionary | Dictionary | 2013-05-02 |
| MacMillan Dictionary | Online dictionary | Dictionary | 2013-05-02 |
| Lasso 9 Reference Library | Lasso 9 reference information retrieval service | Reference | 2013-05-01 |
| Aqua.io | Standardized healthcare code reference service | Reference | 2013-04-22 |
| Black Book Online | U.S. public record search service | Government | 2013-04-18 |
| Stanford HighWire | COUNTER Usage Statistics Service | Education | 2013-04-18 |
| DCMI Metadata Registry | Metadata management service | Reference | 2013-04-18 |
| WSIndex | Index of informational links on web services | Reference | 2013-04-18 |
| Pearson Dictionary | Dictionary and reference service | Dictionary | 2013-04-18 |
| Nasa Exoplanet Archive | Astronomical archive | Science | 2013-04-15 |
| PostcodePal | Geographic datasets for the United Kingdom and Crown Dependencies | Reference | 2013-04-15 |
| U.S. National Library of Medicine ChemSpell | Chemical name spell checker and thesaurus | Reference | 2013-04-15 |
| The Alife Database | Listing of websites related to artificial life | Database | 2013-04-15 |
| Good Business Day Exchanges | International exchange holidays and hours reference service | Financial | 2013-02-28 |





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