From the Smithsonian National Museum of American History - features tons of free classroom resources including history lessons, interactive activities, and more for all grade levels and historical time periods beginning in 1620 through present day.
With Quizizz, it's really easy to create learning games. It’s simple to add audio, and easy to integrate with Google Classroom and, unlike Kahoot, it shows the question and answers in the same screen so students don’t have split them.
Fun vocab game app similar to "Heads Up" game where you tilt your smartphone for correct answers or to pass. Teacher creates the vocab list, then students have to define word correctly to move on to next.