Stats - Simple macOS system monitor in your menu bar.
iStat Menus - "An advanced Mac system monitor for your menubar."
MenuMeters for El Capitan - MenuMeters for OS X El Capitan 10.11 (and later)
Stats Panel - OS & Utilities, Network & Admin, and System & Hardware
Sidebar Diagnostics - SidebarDiagnostics - A simple sidebar for Windows desktop that displays hardware diagnostic information.
eul - System & Hardware and OS & Utilities