d3-funnel
(jakezatecky/d3-funnel)
An extensible, open-source JavaScript library for rendering funnel charts
https://github.com/jakezatecky/d3-funnel
https://jakezatecky.github.io/d3-funnel
CandyGraph
(wwwtyro/candygraph)
A flexible and fast-by-default 2D plotting library tuned for rendering huge datasets on the GPU at interactive speeds.
https://www.npmjs.com/package/candygraph
Fourier series visualisation with d3.js