iStat Menus - "An advanced Mac system monitor for your menubar."
px app - ps and top for human beings
MenuMeters for El Capitan - MenuMeters for OS X El Capitan 10.11 (and later)
Stats - Simple macOS system monitor in your menu bar.
Windows Task Manager - Need assistance with your Microsoft product? Find helpful articles for Windows, Office, Microsoft Account, Microsoft Store, Xbox, and more.
iPulse - Using its concise and appealing user interface, iPulse graphically displays the inner workings of macOS on you desktop, menu bar or Dock.