NirCmd – Windows command line tool

NirCmd is a small command-line utility that allows you to do some useful tasks without displaying a user interface. By running NirCmd with simple command-line options, or via a shortcut, you can decrease or increase the system volume, mute or unmute the system volume, speak the text currently in the clipboard or text file, change the default sound device, display a list of sound devices, change the volume of an app, change the display settings, turn off the monitor, open the door of a CD-ROM drive and more…

Website
Command Reference
Change Default Sound Device
List Sound Devices
Change System Volume
Change App Volume

BatchEncoder ~ An opensource freeware audio conversion frontend

BatchEncoder

BatchEncoder is an audio files conversion software. It supports most of popular audio file formats including lossy and lossless compression. The program is very simple to use. BatchEncoder is basically GUI front-end for command-line tools. All it does is create background processes and pass arguments to it with options set in presets/format menu and additionally adds input and output file paths.

Website
Discussion ~ Hydrogen Audio
GitHub file repository