CSCW
google: collaborative editing
google: International.Workshop.on.Collaborative.Editing

SubEthaEdit http://www.codingmonkeys.de/subethaedit/

SIGCE: An International Special Interest Group on Collaborative Editing http://www.cit.gu.edu.au/~scz/sigce/
CoWord
http://murl.microsoft.com/LectureDetails.asp?1004

效果不好: DocSynch http://docsynch.sourceforge.net/

multi-editoro http://me.sphere.pl/indexen.htm
不到 200k ! 輕薄短小, 不過不支援中文 ..