Which one? Karachan, Vichan, Wilchan, and Żywe gówno are the other Polish imageboards that I know of.
Архів:Kultura polskich anonimowych — Енциклопедія Драматика web.archive.org There is some page about some very early history of Polish chans and there is a section about the old erischan. I had to use archive because some parent website doesn't allow my IP just like 'fe.