One website that I have not hit on yet, that we use weekly in my classroom is FlipGrid. FlipGrid allows students to share short videos made on right on the site. They can add stickers and backgrounds to spice up and have fun with their videos. The newest feature is the QR code AR videos. This allows the video to essentially come off of your phone or tablet and talk to you. We were working on these prior to Spring Break. I will be eager to try that when we have students again.
I am a huge fan of FlipGrid. We use it for weekly Exit Tickets or an overview of what the students learned for the week. We use it when acting out a character in History or when teaching the class. The Topic Boards allow you to organize and control what and when things are placed in your class. This is a must in every classroom.