Real-World Onion Sites

This is a list of substantial, commercial-or-social-good mainstream websites which provide onion services.

no sites with an "onion-only" presence
no sites for products/technology with less than (arbitrary) 10,000 users
no nudity, exploitation, drugs, copyright infringement or sketchy-content sites
the editor reserves all rights to annotate or drop any or all entries as deemed fit
licensed: cc-by-sa
author/editor: alec muffett

You can find techical details and the legend/key for symbols in the footnotes section, below.