The Multimedia Educational Resource for Learning and Online Teaching (MERLOT) “is a community of staff, volunteers, and members who work together in various ways to provide users of OER (Open Educational Resource) teaching and learning materials with a wealth of services and functions that can enhance their instructional experience” . It houses a robust collection of resources that cover over 85k pieces of educational materials covering numerous disciplines. It uses a visual interface that is very user friendly and very searchable. Narrow your search by using their many filters or just click around and brows your options.
Check them out at MERLOT.org