Sharingbuttons.io - Quickly generate social sharing buttons with a tiny performance footprint.
Skip Tunes - Control iTunes, Spotify, or Rdio from your Mac's menubar
Simple Sharing Buttons Generator - Share to Facebook, Twitter, Google+, and other social networks using simple HTML buttons
Baritone - Spotify controls that live in your menubar.
Social Share Kit - Library of CSS/JavaScript social sharing tools
Soundiiz - Transferring playlists between various music streaming platforms.