JGroups

JGroups - A Toolkit for Reliable Multicast Communication.

It can be used to create groups of processes whose members can send messages to each other. The main features include

• Group creation and deletion. Group members can be spread across LANs or WANs
• Joining and leaving of groups
• Membership detection and notification about joined/left/crashed members
• Detection and removal of crashed members
• Sending and receiving of member-to-group messages (point-to-multipoint)
• Sending and receiving of member-to-member messages (point-to-point)

http://www.jgroups.org