Audio routing, Bluetooth battery levels, disk pressure, a custom battery alert: each of these lives in the menu bar and does one job there.
Custom battery alerts at any percentage, not just Apple's low-battery warning
→ getjuicy.app
Multiple time zones in the menu bar, with a meeting-time slider
→ github.com
Menu-bar app that watches a region of your screen and pings you when it changes
→ reddit.com
A menu-bar data meter that never leaves your Mac
→ hotspot-meter.loam.sk
Screen Time, but for your AI agent's token burn
→ tokentime.bar
A Mac menu-bar app that plays whatever you're listening to inside another room
→ surraura.com
Display a single task in your menu bar, and nothing else
→ sindresorhus.com
Bluetooth device battery levels, in your menu bar
→ github.com