Conceited Software (http://conceited.net) has introduced Rubbernet 1.0, a network monitoring solution for Mac OS X. It requires Mac OS X 10.6 or higher and costs approximately US$44. A 15-day demo is available for download.
Rubbernet provides real-time monitoring of your network-enabled apps running on your Mac so you can keep an eye on the exact state of your live network connections. Real-time charting displays download and upload transfer rates for all active apps. Rubbernet provides a breakdown of per-app network usage, and automatically assigns every incoming and outgoing connections to the users they belong to.
It provides a breakdown of per-app network usage, so you can detect apps that phone home, connect to certain servers without your knowledge, or blame the app that’s slowing down your network. Real-time charting displays download and upload transfer rates for all active apps on all monitored Macs. You can visualize your network usage and get a bead on network hogs before they get out of control.
You can monitor all computers on your network from one Rubbernet instance on your Mac. Have multiple user accounts on your Macs? Rubbernet automatically assigns every incoming and outgoing connections to the users they belong to.