Other browser-based irc clients written in nodejs:

KiwiIRC - Probably the most used of them. https://github.com/prawnsalad/KiwiIRC

Subway - I've been following this one for a bit because it look promising. It's nice. https://github.com/thedjpetersen/subway

nirc - This one is pretty simple and I'd say a little less polished than yours, but still does a lot of things right. https://github.com/cjstewart88/nirc

If anyone knows of others, I'm interested.

I'd also like to plug glowing-bear (https://glowing-bear.github.io/glowing-bear/) since it's a rather cool project. It's an entirely static html5 frontend to weechat.