Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
Babyphone Wifi - This app turns your old Android phone into a baby monitor.
EarTrumpet - Volume Control for Windows
Baby Monitor 3G - Turn any two Android, iOS or Mac devices into one single baby monitor. Easy to use, reliable, feature rich and with an unlimited reach!
Sound Control - App-specific volume control
BabyTime - Baby activity recording and monitoring app.