According to the AASL (American Association of School Librarians), these are the best digital tools for teaching:

Best Digital Tools for Teaching & Learning | American Association of School Librarians (AASL) (ala.org)

Use these tools & others in website (Best Digital Tools for Teaching & Learning) to help students with news literacy, critical thinking and other needs.

Bites is great for current events and argumentative essays.

Checkology is a digital news literacy project.

Copyright & Creativity teaches the essentials of copyright and fair use to K-12 students.

New American History is a tool for teachers and students that uses interactive maps, video, audio.

Untold collects compelling history videos and animation.

Wild Classroom encourages students to protect the environment.