ICQ focused on one-on-one chats rather than on chatting in groups, which you would find on services like AOL or even in IRC. ICQ certainly influenced other chat and messaging services like AIM ...

This IRC server is a complete implementation of a chat system that supports multiple clients, authentication, channels, and private messaging. Built with C++, it focuses on non-blocking I/O operations ...

This plugin provides abstract support for instant-messaging notifications to Jenkins ... protocols is implemented by various concrete plugins like the Jabber/XMPP or the IRC plugin, allowing users to ...