AATools is a multithreaded network diagnostic tool.

Its purpose is to accumulate data pertaining to network status and
availability, using all of the latest development tools in network research.

It is a 12-in-1 utility, including TCP/UDP Security Port Scanner, Proxy Analyzer,
RBL Locator, TraceRoute, Email Verifier, Links Analyzer, Whois, Network Monitor,
Process Monitor, System Info, Resource Viewer and Registry Cleaner.

Current version: 5.50 for Windows 9x/Me/NT4/2000/XP

More Info:
_http://www.glocksoft.com/aatools.htm