Europeana Collections
"Europeana Collections provides access to over 50 million digitised items -- books, music, artworks and more -- with sophisticated search and filter tools to help you find what you're looking for." (https://www.europeana.eu/portal/en/about.html)
The SSH Open Marketplace is maintained and will be further developed by three European Research Infrastructures - DARIAH, CLARIN and CESSDA - and their national partners. It was developed as part of the "Social Sciences and Humanities Open Cloud" SSHOC project, European Union's Horizon 2020 project call H2020-INFRAEOSC-04-2018, grant agreement #823782.