EarTrumpet - Volume Control for Windows
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Sound Control - App-specific volume control
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
Power mixer - Power Mixer is a complete Windows volume control replacement.
podsync - Simple and free service that lets you listen to any YouTube or Vimeo channels, playlists or user videos in podcast format