Teachers · College & University
4-year and graduate degrees.Physics
PhET Interactive Simulations
Free interactive math and science simulations from CU Boulder.
PhET
Multi-subject
OpenStax Free Textbooks
Peer-reviewed openly-licensed college textbooks across STEM & humanities.
OpenStax (Rice)
Multi-subject
OER Commons
Huge library of open education resources for all levels.
OER Commons
Tech Careers
IBM SkillsBuild
Free courses & Credly badges in AI, cybersecurity, cloud, data.
IBM
Cloud & Dev
Microsoft Learn
Free hands-on paths for Azure, Power Platform, Microsoft 365.
Microsoft
Multi-subject
MIT OpenCourseWare
Full course materials from MIT lectures, notes, and assignments.
MIT
Research
arXiv Preprint Server
Open-access research papers in physics, math, CS, biology.
arXiv
Research
Google Scholar
Search scholarly literature across disciplines.
Google
Humanities
Project Gutenberg
70,000+ free eBooks including classic literature & references.
Gutenberg
Math
Wolfram MathWorld
Comprehensive math reference for advanced learners.
Wolfram