IRCCloud
Used by 4 peopleirccloud.com ↗

“IRCCloud: lots of open-source software discussions happen on IRC, and this is the one company that makes IRC feel modern and easy.”
Ludovic Chabant Interview, Software developer (Epic) · via Uses This 
“I'm currently working on irccloud.com - a unified web-based irc client+bouncer that keeps you connected all the time.”
Richard Jones Interview, Developer (Last.fm, IRCCloud) · via Uses This