Electronic Journals Library of Regensburg University (journals indicated green are free to use):
EJL Article database with document delivery service (on request, orders are also placed by UL):
Subito

Serial catalogues
Österreichischer Verbundkatalog, Teilkatalog Zeitschriften
ZeitschriftenDatenBank – ZDB (Germany) DOAJ
Directory of Open Access Journals
Lists freely accessible e-journals with a great variety of focuses; in some cases, individual articles can be searched for as well.