EarTrumpet - Volume Control for Windows
Whereby (formerly appear.in) - Collaborate from anywhere - video meetings with no downloads
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
Around.co - Around.co is an app that provides video calls to remote teams all around the world.
Sound Control - App-specific volume control
Remote Meeting - Remote Meeting with Video, Voice, Chat and Screen Sharing