Center for Open Educational Resources and Language Learning (COERLL): According to the COERLL website, "COERLL aims to reframe foreign language education in terms of bilingualism and/or multilingualism. As such, all COERLL resources strive to represent more accurately language development and performance along dialectal and proficiency continua.
COERLL's work is organized around seven basic areas: Applied linguistic research Teaching materials Language assessment Teacher development Less commonly taught languages K-12 initiatives Outreach and dissemination." Language Textbooks - OER Commons: Preschool - High School ~ Includes English, German, Spanish, Arabic, and Portuguese
World Languages - Merlot: This collection contains over 3,000 materials for the following languages ~ Arabic, Chinese, ESL, French, German, Greek, Hebrew, Italian, Japanese, Korean, Latin, Portuguese, Russian, and Spanish.