Thousands of open access dissertations and theses: https://opendissertations.org/
PQDT Open users will have access to search, discover, and preview more than 700 million documents, in formats ranging from HTML, to PDF, to video, to books, and more. They can also download the full text, as available, of any open access content, including the more than 50,000 dissertations and theses available today on PQDT Open.
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 1100 colleges, universities, and research institutions. OATD currently indexes 5,775,433 theses and dissertations