Quassel IRC is described as 'Modern, cross-platform, distributed IRC client based on the Qt5 framework. Distributed means that one (or multiple) client(s) can attach to and detach from a central core that stays permanently online -- much like the popular combination of screen and a' and is a popular IRC Client in the social & communications category. There are more than 50 alternatives to Quassel IRC for a variety of platforms, including Windows, Linux, Mac, Web-based and Self-Hosted apps. The best Quassel IRC alternative is HexChat, which is both free and Open Source. Other great apps like Quassel IRC are Trillian, mIRC, WeeChat and irssi.
Convos is an IRC client that runs in your browser and brings the IRC experience into the 21st century. It features a persistent bouncer on the server side that will keep you online even after you close your browser window. Want to use Convos on your phone? No problem!
Glowing Bear is a sleek, modern web frontend that securely connects to a running instance of WeeChat using its built-in relay protocol. It relies on WeeChat to do all the heavy lifting and then provides some nice features on top of that, like...
Smuxi is an irssi-inspired, flexible, user-friendly and cross-platform IRC client for sophisticated users, targeting the GNOME desktop.
LimeChat is an IRC client for Windows, Mac OS X and iOS.
Features
Can connect to multiple servers in a window By key operation was rich, achieve a sense of comfortable operation Customization capabilities over the details Stable operation at light Search and comfortable log in.
The sushi IRC suite consists of a central daemon and several clients, which communicate via DBus.
Subway is a web-based IRC client with a multi-user backend and a JavaScript-heavy UI. Frontend/backend communication is done with websockets (or best available fallback where not available). The backend supports connection persistence and optional logging when the browser...
Traditionally, chat clients on the Mac have been anything but glamorous. Colloquy is an advanced IRC, SILC & ICB client which aims to fill this void. By adhering to Mac OS X interface conventions, Colloquy has the look and feel of a quality Mac application.
Tiny Tiny IRC is an open source AJAX-powered IRC client. The idea behind this being that you don't need either client software or even a stable network connection to stay connected to IRC, just keep the site opened to see new messages.
Textual is the world's most popular application for interacting with Internet Relay Chat (IRC) chatrooms on macOS.
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This is one of the few listed here that is a near perfect match to Quassel. A bouncer like server is a core component/feature of smuxi. Most of this long list are IRC clients only.