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Most of the chans (2ch/8ch/4chan/420chan ect) are just FreeBSD boxes and cgi/perl scripts http://news.dieweltistgarnichtso.net/interviews/moot-4chan.html http:

• bydo 11y ago
  2ch has been, for over a decade, one of (if not always the absolute) largest discussion forums in Japan. No matter what the base system is, there's some serious infrastructure there.