List of Top Free Open Source & Self Hosted Application for Communication - IRC

IRC communication software.

Convos – Always online web IRC client. Artistic-2.0 Perl
Ergo – Modern IRCv3 server written in Go, combining the features of an ircd, a services framework, and a bouncer. MIT Go
Glowing Bear – A web frontend for WeeChat. GPL-3.0 Nodejs
InspIRCd – Modular IRC server written in C++ for Linux, BSD, Windows, and macOS. GPL-2.0 C++
Kiwi IRC – Responsive web IRC client with theming support. Apache-2.0 Nodejs
ngircd – Free, portable and lightweight Internet Relay Chat server for small or private networks. GPL-2.0 C
Quassel IRC – Distributed IRC client, meaning that one (or multiple) client(s) can attach to and detach from a central core. GPL-2.0 C++
Robust IRC – RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol. BSD-3-Clause Go
The Lounge – Self-hosted web IRC client. MIT Nodejs
Tiny Tiny IRC – An open source AJAX-powered chat platform with support for IRC (Source Code). GPL-3.0 PHP/Java
UnrealIRCd – Modular, advanced and highly configurable IRC server written in C for Linux, BSD, Windows, and macOS. GPL-2.0 C
Weechat – Fast, light and extensible chat client. GPL-3.0 C
ZNC – Advanced IRC bouncer. Apache-2.0 C++