Gizmonitor

Gizmonitor is a simple, yet powerful monitoring system for macOS Yosemite, El Capitan and Sierra. It displays your Mac's main resources usage in a compact and friendly way in the Notification Center. It's the quickest way to keep an eye on your computer's CPU, RAM and network usage, as well as on its remaining battery and system storage space. Choose the resources displayed in real time: - CPU usage - Battery remaining load - Memory usage - Storage space used on the System drive - Network input/output You can also select your favorite color theme amongst 6 themes available : Classic, Cyan, Blue, Green, Red, Brown