BetterAudio is a macOS menu bar app for advanced audio device management. It lets you quickly switch input/output devices, control volume, see what’s currently playing, with easily configurable global keyboard shortcuts.

With coconutBattery you're always aware of your current battery health. It shows you live information about your battery such as how often it was charged and how is the current maximum capacity in relation to the original capacity your battery had when it left the factory.