| API | Description | Category | Date |
|---|---|---|---|
| Home Theater Backdrops | Backdrop images and wallpapers | Media Search | 2012-11-05 |
| ImpactStory | Publication influence metrics service | Reference | 2012-11-15 |
| IMSLP | Public domain music score library | Music | 2012-04-06 |
| Information Environment Service Registry | Scholarly resource discovery and syndication service | Search | 2011-11-03 |
| Innovative Interfaces: Sierra | Integrated library system | Catalog | 2012-06-28 |
| Institute of Development Studies | Research and data repository | Government | 2012-03-23 |
| Kariru Library Search | Japanese library catalog consolidation service | Search | 2012-02-14 |
| LexisNexis Library Express | Business publication search service | Search | 2012-04-19 |
| Library of Congress Subject Headings | Access to the Library of Congress Subject Headings | Reference | 2008-04-06 |
| LibraryThing | Books database and community | Reference | 2008-02-09 |
| LIBRIS | Swedish library search tool | Search | 2011-11-25 |
| MERLOT | Educational resource service | Education | 2012-11-30 |
| Mirlyn | Library catalog and services | Reference | 2011-10-11 |
| National Library of Australia Trove | Library catalog search service | Search | 2012-04-19 |
| National Library of Medicine Digital Collections | Library of medical books and video | Medical | 2013-05-13 |
| NCSU Libraries CatalogWS | Library catalog and services | Reference | 2011-10-11 |
| New York Public Library Digital Collections | Library Digital Collections | Search | 2013-04-08 |
| NSDL Repository Update Service | XML repository content management service | Science | 2012-02-06 |
| NSDL Search | Online science library | Science | 2011-10-25 |
| NYPL What's on the Menu | Library collection of restaurant menu | Search | 2013-01-24 |





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