This might sound like a foolish question, but as a partner I can spin up a test org for any Salesforce edition. I have a few still with the @[number]demo.com username, and I'm trying to identify which edition they are.

Attribution to: Daniel Blackhall

Possible Suggestion/Solution #1

Log in to the org, its part of the page title, e.g. "salesforce.com - Developer Edition"

Attribution to: superfell

Possible Suggestion/Solution #2

I wrote a user script to show the org name in the messages section at the top right of pages. You could modify it to query Organization.OrganizationType.

Attribution to: xn.
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