Question for people that already do generative art: what library (framework) do you recommend? I know a little bit about GLSL but I know it is limiting in some cases
It has some nice options for feeding its own output back into itself as it uses streams rather than callbacks so it's quite good for procedural rendering type tasks (the 'Wibble' example is a good place to start with that)
For a code-based approach, I spent the weekend trying different permutations of Processing and settled on writing p5.js in VSCode. It's easy to set up, you can use vim bindings, and you can copy+paste your code into openprocessing.org if you want to share it (if it's interactive, for example).