The LRE, from European Schoolnet, enables schools across Europe to find free educational content from many different countries and providers, from Austria to Sweden. You must register first, and obviously the resources are in a variety of languages, but you can search by language, subject, keyword or age range. 39,482 Resources are currently available, 11,463 solely in English.
See http://lreforschools.eun.org for full details.