Scouring the telegram channels I found:
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Here is what I found: http://core.eostracker.io/
I am still seeking.
If you have cleos, you can run:
cleos -u http://api.eosnewyork.io:80 system listproducers
Of course you can change the http://api.eosnewyork.io:80 with another top-tier producer. The
listproducers will return the list of 21 block producers.