cio

cio--pronounced "cheo"--is a simple, hackable, curses irc client.

Motivation

cio is developed to be allergic to "feature creep." cio should not contain any features which promote needless complexity or cater to very specific use cases. Instead cio aims to be a sensible base to be extended upon.

cio acheives this in the following ways:

cio itself is one C99 file around ~1000 CLOC
cio does not bother to implement every possible IRC spec
optional features are kept within the "patches" directory"

Download

cio 1.2 (13KB) (2026-06-17)
LICENSE

Features

So what features does cio implement?

TLS
UTF-8
SASL Plain/External
wide-character support
infinite scrollback
emacs-like line editing
logging
resize

Development

You can browse cio's source code repository or get a copy using git with the following command:


	git clone git://kloet.net/cio

Credits

cio is a fork of irc.c written by Quentin Carbonneaux.