Any other good textboards/imageboards/forums, etc.?
Mainly them at *least* having a board related to technology or programming of some sort.
4chan is not welcomed due to /g/ being cancerous at all times now.
For people in the future reading this post, you should join 1436chan. A very good textboard, that's related with gopher(i.e. gopherspace). The design is very minimalist - and not every people there are filled with toxicity. The tech discussions however needs to be upped a little. It's available at khzae dot net.