The Group Communication Service (jGCS) intends to provide a generic API for applications that need group communication primitives, such as virtual synchrony or atomic broadcast. It is a Java based common API to several toolkits such as Spread, Appia, and JGroups.
This release has moved to SVN and hosting on SF.net. Small issues have been fixed. Some tags have been added to help UML relations between interfaces.
URL: Overview | jGCS