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.

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
• Weather - with current temperature, hourly forecast, weekly overview and so much more