>>3,6,14,40
I went looking for this thread, as I just saw a post about this site on cc. In some sense I was hoping that posters in that thread had sought out this thread too, but that doesn't seem to be the case.
I've never posted on Crystal Cafe, but recently I've spent a considerable amount of time lurking the threads on there. Their discussions about imageboards are very interesting to me, because there are often wildly varying perspectives, some of which I never see elsewhere.
I find it interesting to look at different imageboards, and see how differing site cultures which interact with potentially overlapping sets of users can result in very different discussions. Unique sites like cc make this very readily apparent.
Another example of this is one of my other favourite boards, 4taba. Admittedly, I haven't spent much time on 4taba ever since the switch of ownership (not for any particular reason, other than that I did not know the new domain name for a time, and it slipped my mind after that). Shitaba has many similarities to this site, and definitely has an overlapping userbase in its tech threads, but also gives off a much bigger /jp/ vibe.
Most of the other boards that I browse have been mentioned here, and there's not too much that I have to say about them that hasn't already been said here or elsewhere (Lainchan, Sushi, bus-stop).
There's a lot of smaller ones and especially TOR sites that I've more or less forgotten about, save for a big list of bookmarks (e.g. >>5). Sometimes I try to read posts on Japanese textboards. Here's one on TOR that I occasionally check: http://xiwayy2kn32bo3ko.onion/tor/
I liked the idea behind https://chiru.no but the actual imageboard is completely inactive last I checked. I think it's associated with https://shamik.ooo but I haven't really been on there much. I do love the captcha system that they have though.
An honourable mention goes to einchan, which is dead as far as I can tell. There is still one ssh-textboard in the form of whisper.onthewifi.com (the username is bit, and the password is byte).
I'm in the midst of making my own textboard, and I'll likely post it here at some point in the future. I really like the idea of anonymous communication, and I'm always looking for more boards, but oftentimes the boards I like the most are slow enough that I fall out of checking up on them. I haven't checked this very site in a number of months, despite it easily being my favourite textboard.