Futaba
http://www.2chan.net/script/

Futallaby (up to 040103)
http://www.1chan.net/futallaby/

Wakaba
http://wakaba.c3.cx/

moeren
http://moepic.dip.jp/gazo/script/index.php

siokara
(seems to be still in heavy development.
couldn't find a link to an available
version of the script)
http://siokara.ath.cx

Swetnote
(couldn't find a link to an available
version to the script, it's probably
only for people who register or
perhaps even a pay-product?)
http://www.sweetnote.com/

>Swetnote

cynthia
(some weird mix between futaba and 0ch,
still highly experimental)
http://cynthia.bne.jp/

gazo-ch
(also some weird mix between futaba and 0ch,
less experimental, though.)
no success in finding the script, either.
the author's name is goki, his site is:
http://www.goki.org/
one major site that uses gazo-ch is:
http://www.gazo-ch.net

>>4

Might want to add that the script also runs on http://com.80code.com/BBS_2/BBS.cgi

Joyful Note
http://www.kent-web.com/bbs/joyful.html
used on http://4ch.zive.net/~bbs/u4/index.htm