Switch display resolutions or adjust your screen brightness and colors (time-based) from the menu bar.
Check out these Mac Menu Bar Display Apps:
Display Menu
Quickly check for available resolutions, refresh rates, or retina capability on any of your internal or externally connected displays and projectors. Switch between aspect ratios or turn on mirroring with a single click.
Stay
Stay keeps windows in their place. This menu bar app ensures that your windows are where you want them, even as you connect and disconnect displays.
Shifty
QuickRes
Quickly switch resolutions on your Retina display. QuickRes is a screen resolution switcher that unlocks the full power of your Mac’s display. The app even bypasses Apple’s restrictions.
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