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/