National Geographic Kids: Games, articles, and videos about animals and nature

Hour of Code: Learn coding skills

FreeCodeCamp: Learn to code. Build projects. Earn certifications.

Khan Academy: Free online video lessons in math and other subjects

Refreshers for parents on algebra and geometry

Code Monster: teaching Javascript to kids

Scratch: With Scratch, you can program your own interactive stories, games, and animations — and share your creations with others in the online community.  Scratch is a project of the Lifelong Kindergarten Group at the MIT Media Lab.

Lessons about coral reefs, mangroves, etc., via Reef Relief

Mystery Science: fun, easy science lessons for grades K-5 (sign up for 200 lessons free until June 2021)

Two weeks’ worth of fun and easy science projects for kids

60+ fun and easy  science experiments for families, using household ingredients

Software/apps from Texas Instruments

Quarantime – Online school with Science Mom and Math Dad. Each show will feature a science lesson, math activities, interactive games, and stories. Aimed at kids age 7-12.