iStat Menus lets you monitor your system right from the menubar. Included are 8 menu extras that let you monitor every aspect of your system.

Some features:
CPU -- Monitor cpu usage. 7 display modes, multiple core support.
Memory -- Monitor memory usage. 4 display modes, page ins/outs and swap usage display.
Disks -- Monitor disk usage and activity. 6 display modes, ability to hide disks you dont want to see.
Network -- Monitor current and total bandwidth, peak bandwidth, IP addresses, and the ability to hide network connections you don't want to see.
Temps -- Monitor the temperature of your Mac. 2 display modes, ability to hide sensors you don't want to see.
Fans -- Monitor the fan speeds in your Mac. 2 display modes, ability to hide sensors you don't want to see.
Bluetooth -- Control bluetooth status plus monitor the battery level of your Apple wireless keyboard or mouse.
Date & Time -- Date and time in your menubar. World clock display lets you see the time in multiple locations around the world.

What's New:

Version 5.32:

• Improved support for 2017 MacBook Pros.
• Improved support for 2017 MacBooks.
• Improved support for 2017 iMacs.
• Improved per process network monitoring.
• Improved per process memory monitoring in macOS 10.11 and 10.12.
• Improved support for macOS 10.13.
• Improved bluetooth battery monitoring.
• Improved disk monitoring performance.
• Fixed an issue with the sun position in light map.

Screenshots:

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