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The Tor network data archive

DescripTor is a Java API that fetches Tor descriptors from a variety of sources like cached descriptors and directory authorities/mirrors. The DescripTor API is useful to support statistical analysis of the Tor network data and for building services

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A web-based protocol to learn about currently running Tor relays and bridges

A Java library that fetches Tor descriptors from a variety of sources like cached descriptors and directory authorities/mirrors