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CategoryNameLink to API Service Description

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AnnotationReflect APIhttp://reflect.cbs.dtu.dk/restAPI.htmlIdentifies and ‘tags’ biologically and chemically relevant names found in HTML documents

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Cultural worksThe Science Museum (UK)http://api.sciencemuseum.org.uk/documentation/exhibitions/Programmatic access to exhibit information

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Education-relatedOCW (OpenCourseWare) Searchhttp://ocwsearch.com/apiSearch free online university courses

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Education-relatedKhan Academyhttps://github.com/Khan/khan-api/wiki/Khan-Academy-APIAccess to all types of Khan Academy data. It's a RESTful API, and all data is returned via JSON.

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Education-relatedDonorsChoosehttp://developer.donorschoose.org/JSON API allows developers to pull DonorsChoose.org classroom project listings into their website or application using project selection criteria of their choosing

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Education-relatedTeachStreethttp://www.teachstreet.com/apiTeachStreet Classes & Courses API provides access to TeachStreet's local class search engine, delivering class listing data and metadata.

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Environmental DataPachubehttp://api.pachube.com/Realtime sensor, energy and environment data from objects, devices & buildings around the world

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FinanceKiva.orghttp://build.kiva.org/Microfinance data

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GeneralFreebase.comhttp://wiki.freebase.com/wiki/Developers"Freebase is an open, Creative Commons licensed collection of structured data, and a platform for accessing and manipulating that data via the Freebase API."

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HealthHealth Indicators Warehousehttp://healthindicators.gov/Developers/OverviewA unified API to thousands of datasets covering public health.

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Popular NewsThe Guardian (UK)http://www.guardian.co.uk/open-platformAccess to the content API and data store

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Popular NewsThe New York Times http://developer.nytimes.com/docs/article_search_apiArticle archive search

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Popular NewsNational Public Radiohttp://www.npr.org/api/indexShare and mashup the radio station's content

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Research & Reference Mendeleyhttp://dev.mendeley.comAccess Mendeley's over 90M crowd-sourced scholarly articles with reference metadata and readership statistics by sociodemographic info such as country, discipline, and academic status.

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Research & Reference arXivhttp://arxiv.org/help/api/indexAcademic research repository: access 680,000+ e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.

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Research & ReferenceSpringerhttp://dev.springer.com/Access the full-text content, metadata, and images for approximately 80 thousand articles from open access journals in the Biomed Central and SpringerOpen publishing programs.

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ReferenceMediaWikihttp://www.mediawiki.org/wiki/APICode-level access to the entire wikipedia reference

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ReferenceEuropean Patent Officehttp://www.epo.org/searching/free/ops.htmlPatent, family, legal, bibliographic data, and documents available via web

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ReferenceOCLC Classifyhttp://classify.oclc.org/classify2/api_docs/index.htmlDocument classification by author, title, ISBN, etc.

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ReferenceOpenDOARhttp://www.opendoar.org/tools/api.htmlComprehensive and authoritative list of institutional and subject-based repositories

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ReferenceCatalogWS http://www.lib.ncsu.edu/dli/projects/catalogws/index.htmlInformation from the NCSU Libraries Catalog

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Semantic WebDBpedia.orghttp://dbpedia.org/AboutExtract structured info from wikipedia

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Semantic WebEvrihttp://www.evri.com/developerAccess to Evri's mapping of the entity web, or the web of people, places and things

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Social MediaTwitterhttp://dev.twitter.com

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Social MediaTumblrhttp://www.tumblr.com/api

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Social MediaPosterous http://www.posterous.com/api

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Social MediaFacebookhttp://developers.facebook.com/

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Social MediaLinkedInhttp://developer.linkedin.com/

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Social MediaFlickrhttp://code.flickr.com/