As this discussion started with webIRC clients, I'd like to mention the awesome quassel-webserver project from Magne`:

https://github.com/magne4000/quassel-webserver

Basically, the same features as The Lounge, but it just connects to a Quassel core, allowing you to connect to the same core with the desktop app or with the Android app, and allowing you to use the ecosystem of software developed around Quassel.