PeakHour 3.1.1 - Ah.

Version: 3.1.1
Mac Platform: Intel
Includes: Pre-K'ed

OS version: 10.7.3 or later
Processor type(s) & speed: Intel
RAM minimum: -
Video RAM: -

Version 3.1.1:

Improved
• Support for OS X 10.11 'El Capitan'.
• When state change logging is enabled, will no longer write repeated log entries if state hasn't changed and there isn't any bandwidth usage to log.


Fixed
• Added locking to prevent rare crash with configuration updates.
• Paddle and Hockey windows re-opening after they're closed.
• Possible crash when state change logging enabled.
• Possible crash when UPnP devices broadcast an update.

Courtesy of The Shark!

PeakHour is a beautiful, real-time network-traffic visualiser that lives in your menu bar. It provides an instant view of your Internet or WiFi activity in real-time. PeakHour is great for monitoring your Internet or WiFi connection, and can help you determine how much bandwidth your computers and devices are using at any given time.

Note: PeakHour requires a capable, SNMPv1-enabled device to work properly. Many good routers do support SNMP but not all do, so it is important that you check before purchasing. Use the tool in the Related Links to find out if your router is compatible.

More information: http://peakhourapp.com