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