Away Messages

Suggestions for away messages to use with instant messaging clients.
http://www.awaymessages.com/

Jephyr Instant Messaging System

Protocol specification for client-server instant messaging with a Java implementation.
http://hugh-kennedy.chicago.il.us/jephyr/

OnlineCall

Instant messaging service that supports video and voice conversations.
http://www.onlinecall.com/

PresenceWorks

Tool for integrating instant messaging client capabilities into business software.
http://www.presenceworks.com/