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I'd like to learn about the Tor network in terms of numbers, statistics.

Can I find out how many relays the network has and possibly where they are located?

Can I learn about roles the relays play in the network? For example, how many exits/guards/middle (or combination) are there?

Can I learn about individual relays?

Can I learn about how likely it is to use a given exit/guard?

Whenever you can keep track of users, can I find out how many people use Tor/used Tor? If possible even with where they are coming from and if they used vanilla Tor or a Pluggable Transport.

Can I learn about the performance of the network?

Can I learn if the network is in good shape regarding the network-documents that get published like the consensus?

Can this be done somehow, either with tools developed by someone or websites/service or manually?

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Can I find out how many relays the network has and possibly where they are located?

The amount of relays and bridges over time is measured. It's also possible to see the country-specific amount.

Can I learn about roles the relays play in the network? For example, how many exits/guards/middle (or combination) are there?

The amount of assigned flags (e.g., "Running", "Guard", "Fast") is also measured.

Can I learn about individual relays?

There are currently two services: Atlas and Globe. Both are JavaScript-based front ends for the raw data coming from Onionoo.

Can I learn about how likely it is to use a given exit/guard?

Both Atlas and Globe display diagrams which show the guard and exit probability of a given relay over time.

Whenever you can keep track of users, can I find out how many people use Tor/used Tor? If possible even with where they are coming from and if they used vanilla Tor or a Pluggable Transport.

There are a number of approximations on the metrics portal. It is possible to see the estimated total users over time, from which countries they are coming from and, since recently, bridge users by pluggable transport.

Can I learn about the performance of the network?

The metrics portal has information about, e.g., how long it takes to download a file over Tor.

Can I learn if the network is in good shape regarding the network-documents that get published like the consensus?

It's possible to see how much directory traffic is pushed by the authorities.

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The Tor project has a website dedicated to network statistics on metrics.torproject.org.

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  • Let us keep this answer, too. I ask anyone who up-voted this answer to up-vote the more verbose answer, which also mentions Atlas and Globe (Onionoo front-ends). Without removing the up-vote for this one obviously. Also down-voting should be avoided on this one.
    – bastik
    Commented Oct 22, 2013 at 18:19

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