OATD.org aims to be the best possible resource for finding open access graduate theses and dissertations published around the world. Metadata (information about the theses) comes from over 800 colleges, universities, and research institutions. OATD currently indexes 1,883,713 theses and dissertations.
OATD works by harvesting metadata records using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH), a protocol incorporated into the most commonly adopted institutional repository platforms including ePrints, DSpace and Digital Commons. Metadata in OATD comes from over 800 colleges, universities, and research institutions; the tool currently indexes over 1.8 million theses and dissertations. All of them are Open Access and freely accessible, as well as OATD itself which can be used for free.