SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
Mozilla Add-ons - Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.
Cumulus - A SoundCloud player that lives in your menubar.
Extensity - Quickly enable/disable Google Chrome extensions.
Sleeve - Your currently playing track displayed right on your desktop
Extensions switcher - Menu for quick extensions control