I wrote a quick scheduled task to fetch the list from http://user-agents.org/ but is slightly overwhelming... LOL
The final table is 1000+ entries and most are probably no more relevant.
This one may be interesting as well:
https://github.com/monperrus/crawler-user-agents/blob/master/crawler-user-agents.json
though it lacks some info that would be nice to show.
TL;DR: it may be nice to have a repo to add to the list...
I'm not certain what the license is on the SMF mod, nor if it's on GH.
I can't PM Sleepy to ask, either. :P LOL
I guess the more spiders list is a bit outdated, it was last updated in 08? Some are still right, some are gone, some have changed the crawler id. The list emanuele linked to looks like an interesting updated to the list.