Twitter Bookmarks - Create shortcuts to your favorite users/tweets on Twitter
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
MyTweetAlerts.com - Like Google Alerts for Twitter
Sound Control - App-specific volume control
Quuu - Quuu is a curated content suggestion platform that connects to your Buffer queue, allowing you to grow a relevant social media following across your entire social landscape.
Power mixer - Power Mixer is a complete Windows volume control replacement.