Relay Search
The relay search tool displays data about single relays and bridges in the Tor network. It provides useful information on how relays are configured along with graphs about their past.
Top Relays
Top relays are sorted by consensus weight.
The corresponding query in onionoo is the following:
https://onionoo.torproject.org/details?type=relay&order=-consensus_weight&limit=250&running=true
The consensus weight is a value assigned to a relay that is based on bandwidth observed by the relay and bandwidth measured by the bandwidth authorities, included in the hourly published consensus, and used by clients to select relays for their circuits.