Here is VimIRC. As the link says, it is an IRC client that runs under Vim. Now, I never use Vim or any other Vi for that reason. So, this is a reminder of sorts for me.. when I might get forced to use Vi[m], I’ll use this to log on to IRC. I learn that #vi is the Vim channel on freenode.net.
However, Debian doesn’t seem to ship this program.