Institutional research repositories...

...are where universities make publicly available their research output. This can include pre-print journal articles, conference papers and other research outputs, as well as sometimes including dissertations and theses. At UEL we have roar@UEL, but for a list of repositories from other universities, as well as facilities to search across their content, have a look at the following webpage: http://www.arl.org/sparc/repositories/collectedrep.shtml. Alternatively, if you just want a list of all repositories (by continent, then country) from around the world, check out this rather impressive collection of links: http://www.opendoar.org/countrylist.php.