No specific info about version 10.6. Please visit the main page of Activity Monitor on Mac Informer.
Info updated on:
Note: Most recent release available only within OS X 10.11 El Capitan update.
Net Monitor analyzes the network activity of your computer.
Easily access and monitor Mac temperature information from your menu bar.
Monitor selected files and folders and various types of alerts.
This is a tool which collect the time spent on an application.
Continuous Integration(CruiseControl) build monitor.