Efforts have begun to adapt EidoGo for use as a collaborative game editor in the wiki spirit. This page is for ideas, planning, and so on.
The initial impetus for this effort was to create an open source joseki dictionary but the collaborative features could also be used for editing games in all sorts of ways: as part of a wiki like SL, as a teaching aid for things like the GTL, etc.
(Reuven: The idea was raised in a tsumego context before =)
Pasky has begun work that can be seen here:
Justin is currently working on: