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 raphaël.js.

Javascript statistical/mathematical graphing

3D visualisation

Yes, 3D in the browser is performant and convenient. More convenient, than Processing. And you can do 3d dance parties in the browser, which is a pretty thorough test.

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

Everything supports lense flare, which is the main thing.

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

Handy tools

Networks/flowcharts

Weird art toys