Stats - Simple macOS system monitor in your menu bar.
iStat Menus - "An advanced Mac system monitor for your menubar."
eul - System & Hardware and OS & Utilities
MenuBar Stats - Advanced Mac system monitor right from the menu bar
Beaconly - Flexible, easy to use data aggregating menu app that ties relevant information in a macOs menu bar.
iStatistica Pro - System monitor. Reinvented. 💻 🖥