Free download : http://simplenetsoftware.com/downloads/snt.zip

Simple Network Tester measures network performance by sending
test
data between agents installed on any two Windows PCs. Tests cover:

• Available bandwidth
• Response time or latency
• Voice and video streaming quality

Simple Network Tester's unique web-page user interface makes
remote
network testing
as easy as browsing the web. Tests are saved as normal browser
bookmarks. 
This means you can consolidate all your tests in a single document,
email them
to other people to run, or create a troubleshooting page on your
company's
intranet.

Simple Network Tester is also a convenient traffic generator. 
 You can use
it alongside other network testing tools.
You can send data through your network between any number of pairs of
PCs without requiring
cooperation from anyone at those remote locations.

Simple Network Tester is quick and easy to install:
where your users work, in each
remote location, and alongside your web, email and application servers.

• Test connectivity and measure data transfer rates.
• Measure how long it takes for a packet to travel to and from your
  most remote
  location.
  
• Check the quality of voice and video by testing for
  jitter, packet drops, and out of order packets.
• Document benefits from network improvements by creating before and after
  test
  scenarios.

What's New? We're proud to announce the release of
version
3.0 on February 13, 2008.  Version 3.0 adds many new features and
recommended bug fixes. Along with
a new, streamlined user interface, you get:

• Streaming tests now simulate a "jitter buffer" which accumulates
  and re-orders incoming packets. Along with
  all new high-precision timing code you can better simulate VoIP calls
  and video presentations.
• Quality of service. You can optionally set the Differentiated
  Services Code Point (DSCP) and the 802.1p priority
  bits on all traffic streams (file copy, latency test, streaming.)