Understood (for learning and attention issues): https://www.understood.org/en
K-2 Interactives: https://www.uen.org/k-2interactives/
Movement Breaks: https://www.gonoodle.com
Elementary Links: http://weldelementarylinks.weebly.com/
Teen Learning Links: http://teenlearninglinks.weebly.com/
Smithsonian Learning Lab: https://learninglab.si.edu/
21 Things for Kids: http://21things4kids.net/
Design Tips for Accessibility: https://accessibility.blog.gov.uk/2016/09/02/dos-and-donts-on-designing-for-accessibility/
K-W-L for 21st Century: http://langwitches.org/blog/2015/06/12/an-update-to-the-upgraded-kwl-for-the-21st-century/
Assessments and Rubrics: http://www.schrockguide.net/assessment-and-rubrics.html
MathScienceMusic: https://mathsciencemusic.org/