Songstack - Swipe to discover new music for Spotify
Ramsophone - A generative art/music machine. (Be sure to refresh!)
mixmello - mixmello is a free, open source tool to create remixed versions of your favourite playlists.
Generative Art in Go - Learn the basics of algorithmic art with the Go language
Music Walker - Explore and play (via YouTube) songs similar to a seed song.
Big Art - Discover street art