The ARIADNE infrastructure provides access to some hundreds of thousands of learning resources from repositories and collections around the world. This infrastructure is serving a dual purpose: first, it hosts repositories for collaborating institutions that use the ARIADNE tools in order to set up and populate their repositories using the ARIADNE infrastructure; second, it harvests and stores locally metadata records from federated repositories that are hosted elsewhere and operated by institutions cooperating with ARIADNE. The following list is non-exhaustive as the ARIADNE network is continuously growing.