For Math
- http://www.visualpatterns.org/
- http://www.estimation180.com/
- http://mathmunch.org/
- http://nrich.maths.org/frontpage
- http://www.illustrativemathematics.org/
- http://www.insidemathematics.org/index.php
- http://map.mathshell.org/materials/index.php
- http://illuminations.nctm.org/
- http://ime.math.arizona.edu/progressions/ (Progressions Documents for the Common Core State Standards)
- http://serpmedia.org/daro-talks/index.html
- http://fawnnguyen.com/
- http://www.mathalicious.com/
- https://www.desmos.com/
- http://robertkaplinsky.com/
For Education (General)
- https://www.teachingchannel.org/
- http://www.achievethecore.org/
- http://www.cast.org/udl/index.html (Universal Design for Learning)
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