1 OA-Informationsplattformen, OA-Portale 8 1.1 open-access.net 8 1.2 OpenDOAR - The Directory of Open Access Repositories 8 1.3 ROAR - Registry of Open Access Repositories 9 1.4 Open Access Directory (OAD) 9 2 Suchmaschinen 10 2.1 BASE - Bielefeld Academic Search Engine 10 2.2 Google Scholar 12 2.4 Scirus 14 2.5 OAIster 15 2.6 OASE – Open Access to Scientific Literatur / UB Karlsruhe 16 3 Zeitschriften 18 3.1 DOAJ - Directory of Open Access Journals 18 3.2 EZB – Elektronische Zeitschriftenbibliothek 19 3.3 Open-J-Gate 20 4 Repositories 21