SPARQL endpoints with online Web Form interfaces.

Web Form Description
BBC Backstage SPARQL Editor The BBC Backstage SPARQL Editor provides an easy to use SPARQL editor for querying the BBC. It includes some inline examples and lists ( the prefixes of ) the ontologies used.
Dbpedia SNORQL Queries Dbpedia
DBTune Interactive Query SPARQL Query form for DBTune - Music Related RDF
Geosparql Example queries for geonames data. Uses Jena running on the Google app engine, with geospatial index extensions to ARQ.
SPARQLer General purpose SPARQL processor based on ARQ. Implements SPARQL 1.1.
Redland Rasqal RDF Query Demonstration Uses Rasqal to perform queries in either of the RDQL or SPARQL languages over RDF data. The data is loaded into a Redland model and then queried and results accessed via the Redland Perl language binding
Quick and Dirty SPARQL browser General purpose SPARQL processor providing alternative ways of searching.
Semantic Reports Semantic Reports can be used to query a number of different SPARQL end points.