Standing Waves in Pipe: https://www.desmos.com/calculator/jptmctcs1o

Simple Harmonic Motion (with mass and spring control):

https://www.desmos.com/calculator/kz4aap9hu4

Simple Harmonic Motion (with frequency control):

https://www.desmos.com/calculator/mdwjzhqzux

Two Source Interference (draft):

https://www.desmos.com/calculator/13t09ytcyk