Early on, their webpages had all kinds of video clips that had been gathered, and then stills from those which circled individuals they were trying to ID.
Some 2021 threads with mention of them -
https://www.democraticunderground.com/100215339743
https://www.democraticunderground.com/100215515571
https://www.democraticunderground.com/100215735110
https://www.democraticunderground.com/100215755155
There were other threads over the years and they mostly communicated by twitter and used that website to consolidate the info, but then Musk blew twitter up so it's hard to go back and find some of the stuff if you don't have an account (and I don't and never have). 
Here's an NPR article on them - https://www.npr.org/2022/01/05/1070471256/amateur-sleuths-help-to-identify-hundreds-of-suspected-jan-6-rioters
I just saw that a reporter from NBC News is about to release a book about them.
https://www.democraticunderground.com/1017865659
https://www.democraticunderground.com/100218299908
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