Free network testing utility software for windows

Network Catcher, from Shunra Software, is a free network monitoring tool that records and displays latency and packet loss between your PC and any internet site. Use this freeware tool to monitor the quality of your network link. You can save all your recordings and send it to another user via email.
Network Catcher also integrates with Shunras network simulation technology, enabling you to capture and import production conditions directly into network simulation scenarios and test applications under real-life network conditions. Network Catchers production network recordings are also ideal for baselining the performance of the production network, including best case, worst case and average application performance - giving you a great starting point from which to make informed decisions on performance limitations and expectations for new or existing applications that are about to be deployed over the network.
Using production network parameters is ideal for testing applications when the target network already exists, such as a companys corporate network or a customers network. However, if the target network has not yet been designed or built out, you can record a variety of different production networks and create a library of production network conditions which you can then use to test your applications and ensure that that they meet performance expectations in any potential network environment.

LightLoad Load Test Utility- lightweight HTTP web server load testing utility LightLoad is a lightweight web server load testing utility written using the .NET 2.0 Framework, that will allow web developers to quickly assess the response speed of a script and/or server under heavy load.
LightLoad may reveal issues such as inefficiency in code and errors which arise when multiple simultaneous requests are made.
LightLoad can simulate a theoretically unlimited number of users connecting to a resource over a specified period of time. Batches of requests are made in cycles to the resource and the results are averaged to produce a meaningful and comparable statistical analysis.
System requirements:
- NET Framework 2.0

The Network Assistant is a freeware utility that will assist you with basic networking tasks: bandwidth calculation, IP address-related calculations, and password generation.