iStat Menus - "An advanced Mac system monitor for your menubar."
Hidden Bar - A ultra-light MacOS utility that helps hide menu bar icons.
iStatistica Pro - System monitor. Reinvented. 💻 🖥
Bartender Mac App - Bartender is an award-winning app for macOS that superpowers your menu bar, giving you total control over your menu bar items, what's displayed, and when, with menu bar items only showing when you need them.
Stats - Simple macOS system monitor in your menu bar.
Vanilla - Vanilla is a free Mac app that lets you hide icons from your menu bar.