Here's a group I joined many years ago (not aware of any others because it's been so long since I did any work). They're still alive and kicking after all this time though, so I'd imagine they're here to stay.metalsmiths.deviantart.com/
I have been artistically inactive on here for so many years that I'm not sure what's going on in the metal/jewelry scenes nowadays. The website has even gone through a lot of changes over that time, so the way groups communicate is a bit different now. I was a member by the old way they did things but, checking the page just now, it doesn't appear that I was grandfathered in. I still get notifications from them though.
I just now checked your Star Trek stuff and that's awesome!!! I was born and raised a Trekkie