Here's a cool collection of network tools with a handy gui interface. Below is the description from the site:

Project Net Tools © 2006 started as a small project containing some basic Net Tools to make certain procedures easier and faster to do for the network users, since then it kept growing. Net Tools is mainly written in Microsoft Visual Studio. Net Tools 4 contains a whole variety of network tools mainly written with Microsoft Visual Basic 6, Visual C++ and Visual Studio .NET.

http://users.pandora.be/ahmadi/nettools.htm

Don