Glasnost—tool to detect traffic shaping in broadband networks

This tool is old and the service is no longer active, but you can still setup your own server.

 GLASNOST: Test if your ISP is shaping your traffic |
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The goal of our Glasnost project is to make access networks, such as 
residential cable, DSL, and cellular broadband networks, more transparent 
to their customers.

ISPs are increasingly deploying a variety of middleboxes (e.g., firewalls,
traffic shapers, censors, and redirectors) to monitor and to manipulate 
the performance of user applications. Most ISPs do not reveal the details 
of their network deployments to their customers. We believe that this 
knowledge is important to help users make a more informed choice of their 
ISP. Further, such knowledge is also useful for researchers designing 
protocols and systems that run on top of these networks.