PJIRC is a very complete IRC applet which handles multichannel, private conversations, text coloration, graphical smileys, etc. In addition, it's still quite light.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.
