There’s a bot on twitter that runs tweets in a BBC basic interpreter. The code golf aspect is fitting a program in a tweet...
BBC Micro - bot (@bbcmicrobot) on Twitter
https://twitter.com/bbcmicrobot
JSBeeb - Javascript BBC Micro emulator
https://bbc.godbolt.org
Folks have ported Processing from Java to Javascript so it can be run in a browser:
p5.js
https://p5js.org
[–]JasonCarswell[S] 1 insightful - 2 fun1 insightful - 1 fun2 insightful - 1 fun2 insightful - 2 fun - (0 children)
[–]JasonCarswell[S] 1 insightful - 2 fun1 insightful - 1 fun2 insightful - 1 fun2 insightful - 2 fun - (1 child)