Check the Subpages for subject specific resources
CUNY Open Education Curated Collections : Browse by subject to find OER resources that range from textbooks to full lessons
Merlot II : One of the largest databases for finding and sharing OER
Mason OER Metafinder (MOM) : Federated OER search from George Mason University Library
OASIS: A creation of SUNY, this database has 55,000+ records from 52 different reviewed sources
OER Commons: Searchable digital library of OER
Openverse : (formerly "CC Search") Images, Audio, and more