Desmos Activity Builder
Desmos Activity Builder is a great resource that is made by a math focused company, Desmos, but can be used in a wide range of ways. It can be used to make card sorts, simple sets of questions, you can add pictures and videos, along with whatever else you come up with. I attached a spreadsheet with some examples below, but there are definitely ways to use it across content areas.
Desmos for Elementary
CREATE: Desmos Activity Builder Overview