From Google:

YouTube Learning Hub: In partnership with education-focused content creators on YouTube we have also launched the Learning Hub which we’re in the process of expanding and localizing as a destination for safe, curriculum-relevant learning content

TeachPoint

Team Online

AESOP

Headspace - Mindfulness and meditation activities. Free account

NEA Foundations' Global Learning Resources - ideas to connect your classroom and students to ideas and people around the world. Includes global learning resources, lesson plans, digital resources.

Primary Sources on the Web: Finding, Evaluating, Using

Finding Primary Sources for Teachers and Students - National Archives


Discovery Education


Pros and Cons of Controversial Issues - NEA - article published by the NEA with tips and tools to navigate the website: ProCon.org