WeeChat is a free chat client, fast and light, designed for many operating systems. It is highly customizable and extensible with scripts.


There are many alternatives to Quassel IRC for Mac if you are looking for a replacement. The best Mac alternative is WeeChat, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Quassel IRC and 19 are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Quassel IRC are Trillian, irssi, KVIrc and The Lounge.
WeeChat is a free chat client, fast and light, designed for many operating systems. It is highly customizable and extensible with scripts.


Trillian is an instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized between all of them! We think conversation should be easily shared between all of your devices, not trapped as text messages on your phone.




Irssi is a terminal based IRC client for UNIX systems. It also supports SILC and ICB protocols via plugins.



Free open-source IRC client offering cross-platform support, Qt interface, rich scripting, customizable themes, Unicode, SSL encryption, logging, multi-server connectivity, DCC file transfers, plugin system, event automation, proxy and IPv6 compatibility, and localization.


The Lounge is a web IRC client that you host on your own server. This is the official, community-managed fork of @erming's great initiative, the Shout project.

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.



Textual is the world's most popular application for interacting with Internet Relay Chat (IRC) chatrooms on macOS.


ERC, an acronym for "Emacs IRC," is a feature-rich IRC (Internet Relay Chat) client integrated into the GNU Emacs text editor. It provides users with a convenient and powerful tool for connecting to and participating in online chat networks.

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.