Stats - Simple macOS system monitor in your menu bar.
Hugging Face - The Tamagotchi powered by Artificial Intelligence 🤗
iStat Menus - "An advanced Mac system monitor for your menubar."
eul - System & Hardware and OS & Utilities
MenuMeters for El Capitan - MenuMeters for OS X El Capitan 10.11 (and later)
Beaconly - Flexible, easy to use data aggregating menu app that ties relevant information in a macOs menu bar.