Free Teacher's Tools

(some of the sites are free with limits)

Explain Everything

The online interactive whiteboard app where people share and learn without boundaries. Join from any device and collaborate in real-time both visually

https://explaineverything.com/

Vocabulary Words with Spelling Practice

https://www.spellingcity.com/

TinkerPlots

Can be used to teach grades 4 and up in subjects including math, statistics, social science, or physical or biological science

https://www.tinkerplots.com/

CodePen 

Social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn