AnyLink

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AnyLink lets you emulate your network experience through a set of different profiles.AnyLink is a cloud-based emulation service. You can emulate web browsing in various conditions by forwarding your traffic through different network links (e.g. a 3G connection, or a DSL connection). AnyLink uses Facebook's Augmented Traffic Control to emulate links, and network cookies to express which link to use.

More information can be found at http://anylink.stanford.edu .
Currently under development. Please report bugs and feature requests.