Stats Panel Alternatives

This compact utility displays real-time CPU, RAM and disk drives usage meters right on the taskbar notification area, or next to the system clock, that is always visible.

Using a database, it will show information about your SSD, such as the controller, processing tech, NAND type etc.

Activity Monitor displays information about all the processes running on your Mac, including CPU, disk, memory, and network usage. You can see exactly how your computer’s resources are being used via a searchable table, helpful graphs, or even directly in the Dock icon.

macOS status monitoring app written in SwiftUI.

Fanny is a free Notification Center Widget and Menu Bar application to monitor your Macs fans.

MiniUsage displays various data like CPU usage, amount of network flow, battery status and process names which uses much CPU time in a menubar. It takes little space and can display various data, so it's suitable for notebook.

Open Capture and Analytics Tool. If you want to know how well a game is performing on your machine in real-time with low overhead. It supports all major APIs on Windows – Direct3D® 11, 12 and Vulkan® – and can show an in-game overlay.

XRG is an open source system monitor for Mac OS X. XRG allows you to monitor CPU activity, memory usage, battery status, machine temperature, network activity, disk I/O, current weather, and stock market data.

Status bar app for macOS that shows the amount of free disk space left on the hard drive.

ZetaWatch is a small OS X program that displays the zfs status in the menu bar, similar to what iStat Menus does for other information. It is fairly well tested, but due to the current state of libzfs and libzfs_core, changes will be required until the API stabilizes.