A "technology toolbox" for teachers. Everything from copyright, to education journals, to global projects. Tons of resources for teachers K-12.
https://sites.google.com/site/technologytoolboxforeducators/education/technologies

OER for Internet Safety and Digital Citizenship lessons and games that are aimed for upper elementary students. I use the games and some of the lessons to supplement my 4th and 5th grade library curriculum.
https://beinternetawesome.withgoogle.com/en_us/educators

The National Gallery of Art has an app called ArtZone where students can create and learn about art. Great resource to share with your art teachers. https://www.nga.gov/education/kids/kids-app.html