Open Source C IRC Clients

See https://pidgin.im/about/ for more information. Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It is written in C and makes heavy use of GLib and GTK+. Finch is a command line instant messaging program. It also lets you log in to accounts on multiple chat network simultaneously, and it is compatible with the same chat networks as Pidgin. It is written in C and makes heavy use of GLib and ncurses.

Miranda IM is an open source, multi-protocol instant messaging client designed to be very light on system resources, extremely fast and customizable. A powerful plugin-based architecture make Miranda IM one of the most flexible clients on the planet.

BitchX is an IRC client based on ircII/EPIC4. It includes many features that are usually relegated to scripts such as CDCC and flood protection -- you can just start it and go. Development was on hiatus for a while but is now resuming.

IRCD-Hybrid is a lightweight, high-performance Internet Relay Chat server.

Undernet Coder Committee -- ircu development

libircclient is a small but powerful library, which implements client-server IRC protocol. It has all features needed to create your own IRC client or bot, including multi-threading support, sync and async interfaces, CTCP/DCC support, colors, SSL connections and so on.

Bot Sentry is a Pidgin (libpurple) plugin to prevent Instant Message (IM) spam. It allows you to ignore IMs unless the sender is in your Buddy List, the sender is in your Allow List, or the sender correctly answers a question you have predefined.

X-Chat Aqua is X-Chat with an Aqua interface for MacOS X. X-Chat Aqua uses the irc engine from X-Chat, and is designed to look and feel like the GTK+ front end.

Windows (XP/Vista/7/8/10) ports of the Eggdrop IRC bot

Fire is a multi-protocol instant messenger client for Mac OS X based on freely available libraries for each service. Currently Fire handles AOL Instant Messenger®, ICQ®, MSN® Messenger, Jabber, limited IRC, Yahoo!®, and Apple Bonjour communications.

Features include: authentication, channel control, a full-featured Memo system, a Seen system, logging capabilities, a help system, the ability to act as a file sharing node and the ability to share data and perform functions together with other bots.

[ Please read https://sourceforge.net/p/darkbot/news/2014/01/darkbots-revitalization/ ] Darkbot is a portable IRC chat robot written in the C language that can be taught responses to user inquiries, and even have conversations with them. Darkbot was originally created by Jason Hamilton as an aid for help channels on Intenet Relay Chat.

A pidgin plugin that allows user to assign global hotkeys (e.g. Ctrl+Alt+g) for togglling buddy list and reading queued message. When "Toggle List" hotkey is enabled, it makes the buddy list hidden from your taskbar and task switcher (similar to ICQ).

X-Chat is an IRC (Internet Relay Chat) program for Linux and Windows.

miau is a small but fully featured IRC-bouncer/proxy. Features include so-called quicklogging, logging, auto-opping and dcc-bouncing. Most features can be enabled/disabled with configure-script.

Ayttm is an instant messenger program, supporting various protocols such as MSN, Yahoo, AIM, Jabber, and more. It is the heir of the Everybuddy project, and aims to continue improving the program and addressing its shortcomings.

Gamers.IRC is a full MSL Script for mIRC, the most popular Windows IRC client. Gamers.IRC is for Windows 95 and higher. Source code: Download and run the installer. Open the .grc and .ini files with notepad.

Eggdrop is the most advanced IRC robot available. It has been under development since December 1993, and unlike most other bots, it is still regularly updated.

muh is a smart IRC-bouncing tool that remains on IRC all the time. You can take control over your nick by connecting to muh with an IRC client that is able to supply a password for the server connection.

srvx IRC Services is a ground-up implementation of services for IRC networks (supporting IRCu2.10, Bahamut, and other IRC server dialects). Features include POSIX threading, generalized proxy detection and all the standard services users expect.

gruftistats is a program to read IRC logs and produce an HTML page of statistics and amusing facts about an IRC channel.

This module converts the log files of your eggdrop to the html format. It also creates a page-calendar with links to that created files.

WebBot is a flexible IRC bot written in C capable of extracting information from a custom list of websites, including searchable ones, using regular expression patterns. HTTP GET and POST methods supported as well as HTTP redirects.

This is an IRC bot written in Delphi. It has a modular structure, based on a small kernel and some plugins all around. A plugin can be a script engine or any hard coded irc events handler. Those plugins can be written in any language (Delphi, C++/C...)

psyBNC is an easy-to-use, multi-user, permanent IRC-Bouncer with many features. Some of its features include symmetric ciphering of talk and connections (Blowfish and IDEA) It compiles on Linux, FreeBSD, SunOs and Solaris.