StatsCenter is a fantastic and comprehensive tool for your Mac that lets you monitor real time system statistics. The app runs as a widget under the Today view tab of your Mac’s Notification Center.

Features

• With StatsCenter, you get real time system stats (with full Retina support) for the following wide array of modules:
  
• System Performance - User and System Performance, displayed as percentages in a moving line graph
  
• Disk Usage - Total Disk Usage levels and how much space is free on your system
  
• Memory Usage - Color coded graphical display of App Memory, Wired, Compressed, Used, File Cache and Total Memory
  
• Network Activity - External IP, Local IP and Network In/Out information
  
• Battery Stats - Current Charge Level, Battery Age, Battery Health, Cycles Run, Current and Original Max Levels
  
• The app allows you to reorder the modules in any order you wish, and you can also choose to toggle on/off any of the modules that you desire to your preferences.
  

Version 1.4:

• Bug fixes