Desmos is an online interactive graphing calculator that is pretty powerful. There are a number of ready made lessons already created and shared online (see examples below). It seems like a good potential tool in an online class to have students creating and sharing graphs.
https://www.desmos.com/calculator/unsox3phkb
https://www.desmos.com/calculator/ooau4av9cz
-Approximating definite integrals using Riemann sums (left, right or midpoint). Sliders to control interval and number of rectangles.
https://www.desmos.com/calculator/q0vy8feq5h
https://www.desmos.com/calculator/xxyyjofuxo
-Taylor Polynomials
https://www.desmos.com/calculator/m2iciw8hlh
-11x^2+12x+13 had no real roots What is the only day that has an integer root? 11x^2+day(x)+13
http://simplifyingradicals2.blogspot.com/2013/11/conic-capture-game.html
-Conic capture game (using desmos)
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