EarTrumpet - Volume Control for Windows
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Sound Volume Hotkeys - This tool allows to control sound volume using system-wide hotkeys.
Synctuition Meditation Program - Synctuition Meditation Program is a world’s most leading meditation app that comes with brand new 3D sounds that enhance the quality of sleep significantly.
SoundSource - The sound control that should be built into MacOS
Calm - Calm.com can help you reduce stress and increase calm.