Splash for Roblox - Make music, get famous
Ramsophone - A generative art/music machine. (Be sure to refresh!)
Roland 808303.studio - TR-808 drum machine and TB-303 bass synthesizer emulator
Generative Art in Go - Learn the basics of algorithmic art with the Go language
Sampulator - Make (and record) beats on your keyboard
Playform - Harness the power of artificial intelligence to expand your imagination and productivity, without learning how to code.