Wikipedia
OpenDOAR
OpenDOAR is a website that lists academic open access repositories. It is searchable by locale, content and other measures. The service does not require complete repository details and does not search repositories' metadata.
OpenDOAR is maintained by the University of Nottingham under the SHERPA umbrella of services and was developed in collaboration with Lund University. The project is funded by the Open Science Institute, Jisc, the Consortium of Research Libraries (CURL) and SPARC Europe.