Currently Alive SPARQL Endpoints

(alphabetical. let's avoid PoorMansHypertext and in-your-face URIs, please)

Project	status	SPARQL endpoint	Webform	comment
Wikidata	(2017-02-23) alive	endpoint	GUI	See also SPARQL federation input
BBC Programmes and Music	(2010-06-29) alive	endpoint	Ajax based Visual Query Builder	Powered by OpenLink Virtuoso; also supports Faceted Browsing and Exploration
Bio2RDF	(2010-01-07) alive	List of 40 SPARQL endpoints	n/a	uses OpenLink Virtuoso
BioGateway	(2010-01-07) timeout	endpoint	webform	BioGateway provides many parameterizable SPARQL queries, both biological as ontological, on RDF graphs that were optimized for querying. The graphs have relational closures. Empowered by OpenLink Virtuoso.
BBC Backstage (HP Labs)	(2010-01-07) server not responding	endpoint	webform	uses joseki 3
BBC John Peel sessions from DBTune (Centre for Digital Music, Queen Mary, University of London)	(2010-01-07) alive	endpoint	n/a	dbtune aims to gather and interlink music-related information.
BBC playcount data from DBTune (Centre for Digital Music, Queen Mary, University of London)	(2010-01-07) alive	endpoint	n/a	dbtune aims to gather and interlink music-related information.
DailyMed	(2010-01-07) alive	endpoint		a D2R endpoint
data.gov	(2010-05-22) alive	endpoint	webform	uses OpenLink Virtuoso
data.gov.uk	(2010-02-04) alive	endpoint	webform	The data.gov.uk endpoint
DBLP Bibliography Database published through D2R Server (Freie Universität Berlin)	(2010-01-07) alive	endpoint	webform (Maybe only Firefox)	The DBLP database provides bibliographic information on major computer science journals and conference proceedings.
DBpedia (University of Mannheim, Universität Leipzig, OpenLink Software)	(2010-01-07) alive	endpoint	SNORQL webform (Firefox/Safari/Opera); Ajax based Visual Query Builder	dbpedia.org is a community effort to extract structured information from periodic Wikipedia dumps and to make this information available on the Web. It is served to the public via a live instance of OpenLink Virtuoso, and also offers Faceted Browsing and Exploration
DBpedia-live ( Universität Leipzig, University of Mannheim, OpenLink Software)	(2010-01-07) alive	endpoint	webform	Based on, now parallel to, and soon to replace the existing dbpedia.org data sets, DBpedia-Live is constantly updated, based on Wikipedia change-feeds. It is served to the public via a live instance of OpenLink Virtuoso, and also offers Faceted Browsing and Exploration
German DBpedia (AG Corporate Semantic Web, Freie Universität Berlin)	(2008-10-15) alive	endpoint	site	de.dbpedia.org is the German language chapter of DBpedia
DBpedia Live German (AG Corporate Semantic Web, Freie Universität Berlin)	(2008-10-15) alive	endpoint	site	de.dbpedia.org is the German language chapter of DBpedia
Spanish DBpedia (Universidad Autónoma de Madrid, Universidad Politécnica de Madrid, OpenLink Software)	(2011-04-04) alive	endpoint	site	es.dbpedia.org is the Spanish chapter of DBpedia
Diseasome	(2010-01-07) alive	endpoint		a D2R endpoint
DoapSpace	(2010-01-07) away	endpoint	webform	This is a highly experimental TurboGears with rdflib triplestore (mysql) SPARQL endpoint.
DrugBank	(2010-01-07) alive	endpoint		a D2R endpoint
EEA (European Environment Agency) Semantic Data Service	(2012-06-06) alive	endpoint	webform	Focus on european environmental datasets and related environmental ontologies. Backend powered by OpenLink Virtuoso Open-Source edition
FactForge (Live Demo Server)	(2010-09-01) alive	endpoint	webform	FactForge uses Ontotext's GraphDB as backend and integrates 8 of the LOD datasets: DBPedia, Geonames, Wordnet, Freebase, etc. FactForge uses an approach called reason-able views to the web of data - the idea of collecting, cleaning up, and indexing multiple datasets into a single semantic repository, in a way which allows those to be queried and used in a reliable fashion.
FlyAtlas	(2010-01-07) alive	endpoint	n/a	Derived from data published by flyatlas.org.
Fly-TED	(2010-01-07) alive	endpoint	n/a	derived from data published by fly-ted.org
Gene Expression In-situ Images of fruitfly embryogenesis	(2010-01-07) can't connect	endpoint	webform	Microscopy images showing gene expression patterns during fruitfly embryogenesis, tied to an anatomical ontology
Gene Ontology Database	(2010-01-07) can't connect	endpoint	webform	a D2RQ wrapper for the Gene Ontology Database (demo)
Henry from DBTune (Centre for Digital Music, Queen Mary, University of London)	(2010-01-07) temp. unavailable	endpoint	n/a	dbtune aims to gather and interlink music-related information.
Health Care and Life Science Knowledge Base (HCLS KB, hosted by DERI Galway)	(2010-08-30) alive	endpoint	n/a	Collection of dataset created in the context of the W3C Semantic Web Health Care and Life Sciences (HCLS) Interest Group over the past years. Roughly 400 million triples. This endpoint contains data that is also contained in some of the other SPARQL endpoints in this list (such as Neurocommons, LinkedCT, Drugbank etc.).
IBM ATG (Advanced Technologies Group)	(2010-01-07) timeout	endpoint	webform	An RDF server front-ended by the Atom publishing protocol
International Chronostratigraphic Chart (Geologic Timescale)	(2015-01-09) alive	endpoint	Linked Data interface	An RDF server front-ended by a Linked Data API
Jamendo from DBTune (Centre for Digital Music, Queen Mary, University of London)	(2010-01-07) alive	endpoint	n/a	dbtune aims to gather and interlink music-related information.
LinkedCT	(2010-01-07) alive	endpoint		a D2R endpoint
Linked Neuron Data (LND)	(2014-08-01) alive	endpoint	n/a	Linked Neuron Data (LND) is a linked open domain knowledge base on brain and neuroscience,containing knowledge on multi-scale brain structures, associations among cognitive functions, brain diseases, and brain building blocks at multiple scales.
Linked Movie Data Base	(2010-01-07) alive	endpoint	n/a	based on D2R Server
LOD Cloud Cache	(2010-01-07) alive	endpoint	Ajax based Visual Query Builder	Powered by OpenLink Virtuoso; also supports Faceted Browsing and Exploration
Magnatune from DBTune (Centre for Digital Music, Queen Mary, University of London)	(2010-01-07) alive	endpoint	n/a	dbtune aims to gather and interlink music-related information.
Musicbrainz from DBTune (Centre for Digital Music, Queen Mary, University of London)	(2010-01-07) alive	endpoint	n/a	dbtune aims to gather and interlink music-related information.
myExperiment	(2010-01-07) alive	endpoint	n/a	myExperiment makes it really easy to find, use and share scientific workflows and other files, and to build communities.
Neurocommons	(2010-01-07) alive	endpoint	Webform	OpenLink Virtuoso based
neXtProt	(2015-05-01) alive	endpoint	Snorql Web Platform with more than 100 examples	A knowledge platform on human proteins. OpenLink Virtuoso based
OpenLink Data Spaces (Live Demo Server)	(2010-01-07) alive	endpoint	Ajax-based Visual Query Builder	supports Semantic Bank's HTTP API for populating RDF Database. create your own experimental account for SPARQL querying. project docs.
OpenLink Virtuoso (Basic Live Demo Server)	(2012-07-27) dead	endpoint	Ajax based Visual Query Builder	supports Semantic Bank's HTTP API for populating RDF Database. create your own experimental account for SPARQL querying. Also includes Named Graph Support — You can discover the different Graph URIs in the Quad Store via `SELECT DISTINCT ?g WHERE { graph ?g { ?s ?p ?o } }` , using the Web based SPARQL UI or Query Service Endpoints above. tutorials: executing SPARQL over SQL from PHP and other general purpose functionality demos. RDF and SPARQL specific docs.
Project Gutenberg Metadata (Freie Universität Berlin)	alive	endpoint	webform	—
rdfabout.com	(2010-01-07) alive	endpoint		uses SemWeb for .NET
Revyu	(2010-01-07) alive	endpoint	n/a	—
RKBExplorer	(2010-01-07) alive	wildcard endpoint	wildcard webform	Lots (~40) of different KBs, many focused on people, publications, research areas, projects. Replace * in wildcard URIs with data set names, e.g. NSF, Cordis, DBLP, CiteSeer, UNLocode, WordNet, etc..
SemanticWeb.org Dog Food	(2010-01-07) alive	endpoint	webform	Using Sesame2 documentation
SemanticWebSchool - Vienna	(2010-01-07) no server	endpoint	webform	The SemanticWebSchool provides the latest information on issues about the SemanticWeb in form of it's d2r mapped press collection with glossary, wikilinks and so forth using the d2r-server and rss features.
SPARQLer	(2010-01-07) alive	endpoint	webform	based on ARQ and Joseki
Sparqlette	(2010-01-07) alive	endpoint	n/a	many options
STW Thesaurus for Economics	(2010-01-07) alive	endpoint	n/a	using SPARQLite. A STW web service is available as well
Information about the Web-based Systems Group @ Freie Universität Berlin	(2010-01-07) alive	endpoint	webform (Only Firefox)	published through D2R Server
TaxonConcept/GeoSpecies	(2010-08-23) alive	endpoint	Ajax based Visual Query Builder	Sparql Endpoint containing species related information including data from TaxonConcept.org, GeoSpecies.org, DBpedia.org. See sparql-endpoint description Powered by [Virtuoso OpenSource Server]; also supports Faceted Browsing and Exploration
University of Florida VIVO	(2013-01-16) alive	endpoint		Endpoint for querying the University of Florida's VIVO instance. Uses the VIVO ontology (details).
URIBurner.com	(2010-01-07) alive	endpoint	Ajax based Visual Query Builder	Powered by OpenLink Virtuoso; also supports Faceted Browsing and Exploration
UniProt	(2012-10-18) alive	endpoint	[1]	uses OWLIM-SE from ontotext
voiD Data via RKBExplorer	(2010-01-07) alive	endpoint	webform	—
W3C Spanish Office SPARQL Demo	(2010-01-07) alive	endpoint	n/a	page in Spanish
Wiki.Ontoworld.org	(2010-01-07) can't connect experimental	endpoint	n/a	—
World Factbook (Freie Universität Berlin)	(2010-01-07) alive	endpoint	webform	—
Linked Periodicals	(2010-01-07) alive	endpoint	webform	Hosted in the Talis Platform

Buggy Endpoints

}

Dead Endpoints

Project	status	SPARQL endpoint	Webform	comment
Mindswap	alive, but returns results embedded in HTML as a table element, even when requesting application/xml	endpoint	n/a	uses Pellet ?

Project	status	SPARQL endpoint	Webform	comment
AIFB	(2010-01-07) 404 since April 2009	endpoint	n/a	uses KAON2
Opera Community	2009-02-12 "Please note: The SPARQL Query Engine is currently offline."	endpoint	n/a	based on Redland/Rasqal
SparqlSphere	dead until I have a bit of admin time -- DannyAyers	[SPARQL endpoint]	webform	based on Redland/Python

Commentary

FWIW, MarkABaker didn't think this list will get very big in the long run. He seems to have been proven wrong, so this comment has been moved to the bottom....

Mark responds; wrong? Well, this is hardly the long run, but ~40 endpoints might as well be zero on the scale of the Web. When you get a few million, drop me a line 8-)