Explorable explanations, interactive computing, Creative coding

http://vitor.io/on-dynamicland

http://explorableexplanations.com/

http://bl.ocks.org/ – distill.pub

https://academo.org/demos/

https://deepui.io/

https://idyll-lang.github.io/introduction

aparatus: https://github.com/cdglabs/apparatus

https://github.com/bijection/g9

http://bl.ocks.org/blacki/ebba08223eba20b56b62

Concrete mathematics

AugMath

http://1023.io/p5-inspector/

REPL

IPython, Hydrogem (Atom plugin)

Observable – video

These last few are quite useful for Data science and Data visualization