The Living Thing / Notebooks :

Browser data visualisations

General javascript drawing

If you want to do SVGs, snap.js is a modern svg library by the author of raphaƫl.js.

Javascript statistical/mathematical graphing

3D visualisation

Yes, 3D in the browser is performant and convenient. More convenient, than Processing.

Two common options use OpenGL ES, the mobile- and browser- friendly option.

Everything supports lense flare.

For desktop apps and a larger OpenGl subset there is a desktop option, Plask which seems to be some kind of particle-system-friendly, OSX app, with spurty development but spectacular potential.

Handy tools

Networks/flowcharts

Weird art toys

p5.js centi.js