Europeana Labs: http://labs.europeana.eu
“This new Europeana Labs website is intended to provide all you need to get started using the Europeana APIs. Learn about the data, see what others have created, and find out how to build simple but powerful queries to extract bespoke results from a dataset of over 30 million objects – books, photos of art and artefacts, audio clips and more.
Last year we consulted with the developer community asking them what things would help them to make best use of the Europeana APIs. This Europeana Labs Beta site is the first major step towards putting in place the things we were told, but also a chance for us to learn more and make improvements before a full launch in late June.”