Europeana
Access 
The project aims at making Europe's cultural and scientific resources accessible to all, so users can freely access any item.
Fee Policy 
The entire content is open to anybody, in accordance with the project's mission to make Europe's cultural and scientific resources accessible to all
Free Retrieved Material
Users can browse, search and access each item for free
Linking Richness
Great linking structure, both for internal navigation and external sources (also to view items in original context)