1 Free and Open-source Irc Apps for macOS (Intel and Apple Silicon)

1- Adium

Instant Messenger and XMPP client for macOS

Adium is a free and open source instant messaging application for OS X, written using OS X's Cocoa API, released under the GNU GPL and developed by the Adium team. Based on the libpurple protocol library, Adium can connect you to any number of messaging accounts on any combination of supported messaging services and then chat with other people using those services.

Read about Adium 's features, license, platforms, and more.