I like the post office: https://afternoon.dynu.com/index.html
Secret Area of VIP Quality: https://secretareaofvipquality.org/saovq/
most of the stuff I do nowadays is on discord though ;w; I guess that's just the nature of the beast (I MISS OLD SCHOOL FORUMS SO MUCH)

there's a lot of toxic/edgy humor on text & imageboards thanks to spillover from 4chan, but it doesn't change the nostalgia I have for the software itself. there are jerks and people using slurs everywhere, I'm not gonna let that turn me off of an entire platform, and I don't post in threads/read stuff with vile things in it.