EIRC is an IRC client program written entirely in Java using only Java API version 1.1, for compliance with once mainstream web browsers. It runs both as an applet and as an application.
Trivbot is a a multilingual quiz/trivia bot for IRC channels. It is written in java so it can run on multiple platforms. A question is sent to the IRC channel and the text in the channel scanned for a string that matches one of the accepted answers.