Shared Spotify - Find the common songs you have between friends
Code2Flow - An easy solution to create product flows.
Playlist Souffle - Swap Spotify playlist tracks based on album or artist
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Songlink - Share music with anyone.
Flowchart.js - Draw SVG flow charts from simple text representations of the diagrams.