OER Commons can be a little overwhelming. Here are their resources by subject:
Applied Science
Architecture and Design
Computer Science
Engineering
Environmental Science
Health, Medicine and Nursing
Information Science
Arts and Humanities
Art History
Graphic Arts
Languages
Literature
Performing Arts
Philosophy
Religious Studies
Visual Arts
World Cultures
Business and Communication
Accounting
Communication
Finance
Journalism
Management
Marketing
Public Relations
Career and Technical Education
Agriculture
Criminal Justice
Culinary Arts
Electronic Technology
Environmental Studies
Film and Music Production
Graphic Design
Manufacturing
Maritime Science
Welding
Education
Early Childhood Education
Elementary Education
Higher Education
Language Education
Special Education
English Language Arts
Composition and Rhetoric
Language, Grammar and Vocabulary
Reading Foundation Skills
Reading Informational Text
Reading Literature
Speaking and Listening
History
Ancient History
U.S. History
World History
Law
General Law
Life Science
Anatomy/Physiology
Biology
Botany
Ecology
Forestry and Agriculture
Genetics
Nutrition
Zoology
Mathematics
Algebra
Calculus
Functions
Geometry
Measurement and Data
Numbers and Operations
Ratios and Proportions
Statistics and Probability
Trigonometry
Physical Science
Astronomy
Atmospheric Science
Chemistry
Geology
Hydrology
Oceanography
Physical Geography
Physics
Social Science
Anthropology
Archaeology
Cultural Geography
Economics
Ethnic Studies
Linguistics
Political Science
Psychology
Social Work
Sociology
Women's Studies