OAIster- This link opens in a new window
OAIster is a union catalog of millions of records representing open access resources. It was built by harvesting from open access collections worldwide. Today, OAIster includes more than 25 million records representing digital resources from more than 1,100 contributors. The records for these items are included in OCLC's Worldcat, but if you want to search just for open access content, you can do that through a separate OISter interface.