The Martyr Java IRC Library
- A library to manage the IRC protocol and client state in Java, separate from any client implementation.
- http://martyr.sourceforge.net

Free Java Chat
- Freeware Java chat applets to put on your website. Has ability to connect to IRC.
- http://www.freejavachat.com

CBIRC
- Powerful IRC client written in Java. Supports all common standards (RFC 1459/2812, ident, mIRC colors). A Java web start version is available.
- http://www.bratschi.net/cbirc/

JWIRC
- Java IRC client with unique features.
- http://www.jwirc.com/

Apirc
- ID Net - IRC Java Software. [Free for non-commercial]
- http://www.prgs.id-net.fr/

Nitz
- A Java based IRC Chat Client. [Freeware]
- http://www.superior.net/~tech/nitz/

Alphaworks IRC client
- From IBM research. [Freeware]
- http://www.alphaworks.ibm.com/tech/irc

Relay IRC Project
- Project aims to create an easy-to-use, multi-platform and scriptable Java-based IRC client and a set of Java classes for adding IRC capabilities to other Java programs. [Open Source, MPL]
- http://relayirc.sourceforge.net

Lirc
- Open Source Java IRC client that supports DCC and multiple server connections.
- http://www.vonnieda.org/Lirc/