Experience Tumblr like never before
https://sketchpad.app/en/ Good for sketching out problems you can’t do in your head
https://www.desmos.com/calculator It graphs out equations in front of you as you type it in
https://www.desmos.com/scientific It’s a scientific calculator I use it for sin, cos, and tan
https://www.calculator.net/triangle-calculator.html type in 3 values of a triangle and it will show you the rest