BitchX is a free IRC client that has been regarded as the most popular ircII-based IRC client. The initial implementation, written by "Trench" and "HappyCrappy", was a script for the IrcII chat client. It was converted to a program in its own right by panasync. BitchX 1.1 final was released in 2004. It is written in C and is a TUI application utilizing ncurses. GTK+ toolkit support has been dropped. It works on all Unix-like operating systems, and is distributed under a BSD license. It was originally based on ircII-EPIC, and eventually it was merged into the EPIC IRC client. It supports IPv6, multiple servers and SSL, and a subset of UTF-8 with an unofficial patch.
Irssi is an Internet Relay Chat (IRC) client program for Linux, FreeBSD, macOS and Microsoft Windows. It was originally written by Timo Sirainen, and released under the terms of the GNU GPL-2.0-or-later in January 1999.
ICQ New is a cross-platform instant messaging (IM) and VoIP client. The name ICQ derives from the English phrase "I Seek You". Originally developed by the Israeli company Mirabilis in 1996, the client was bought by AOL in 1998, and then by Mail.Ru Group in 2010.
ChatZilla is an IRC client that is part of SeaMonkey. It was previously an extension for Mozilla-based browsers such as Firefox, introduced in 2000. It is cross-platform open source software which has been noted for its consistent appearance across platforms, CSS appearance customization and scripting.
Trillian is a proprietary multiprotocol instant messaging application created by Cerulean Studios. It is currently available for Microsoft Windows, Mac OS X, Linux, Android, iOS, BlackBerry OS, and the Web. It can connect to multiple IM services, such as AIM, Bonjour, Facebook Messenger, Google Talk (Hangouts), IRC, XMPP (Jabber), VZ, and Yahoo! Messenger networks; as well as social networking sites, such as Facebook, Foursquare, LinkedIn, and Twitter; and email services, such as POP3 and IMAP.
Pidgin is a free and open-source multi-platform instant messaging client, based on a library named libpurple that has support for many instant messaging protocols, allowing the user to simultaneously log in to various services from a single application, with a single interface for both popular and obsolete protocols, thus avoiding the hassle of having to deal with new software for each device and protocol.
Yahoo! Messenger was an advertisement-supported instant messaging client and associated protocol provided by Yahoo!. Yahoo! Messenger was provided free of charge and could be downloaded and used with a generic "Yahoo ID" which also allowed access to other Yahoo! services, such as Yahoo! Mail. The service also offered VoIP, file transfers, webcam hosting, a text messaging service, and chat rooms in various categories.
Google Talk was an instant messaging service that provided both text and voice communication. The instant messaging service was variously referred to colloquially as Gchat, Gtalk, or Gmessage among its users.
The following tables compare general and technical information between a number of notable IRC client programs which have been discussed in independent, reliable prior published sources.
Maemo is a software platform originally developed by Nokia, now developed by the community, for smartphones and Internet tablets. The platform comprises both the Maemo operating system and SDK. Maemo played a key role in Nokia's strategy to compete with Apple and Android, which failed for complex, institutional and strategic reasons.
Empathy was an instant messaging (IM) and voice over IP (VoIP) client which supported text, voice, video, file transfers, and inter-application communication over various IM communication protocols.
Spacewalk is open-source systems management software for system provisioning, patching and configuration licensed under the GNU GPLv2.
WeeChat is a free and open-source Internet Relay Chat client that is designed to be light and fast. It is released under the terms of the GNU GPL-3.0-or-later and has been developed since 2003.
Ircle was an IRC client developed by Onno Tijdgat for the Macintosh computer platform. Ircle was shareware, with free upgrades. The client was scriptable with AppleScript, supported multiple channels and servers, and up to ten simultaneous connections. It was discontinued in 2009. Since 2012, Ircle was not compatible with most recent versions of OS X, and no updates were available. In December 2017 the Ircle home page displayed a poll, to end Q2 2018, to determine whether a new version should be released on OS X and iOS. The results of the poll were 311 votes in favor of a new Mac OS version, 43 votes for an iOS version, and 117 votes for both a Mac OS and iOS version, out of 528 votes cast.
XiRCON is a discontinued freeware IRC client for Microsoft Windows. After TCP/IP was added to Windows, XiRCON was one of the most popular IRC clients on the platform. The XiRCON client was used for a number of fields, such as library helpdesk, genealogy, and US Naval command. Author Mark Hanson ceased development in 1997.
Cryptocat is a discontinued open-source desktop application intended to allow encrypted online chatting available for Windows, OS X, and Linux. It uses end-to-end encryption to secure all communications to other Cryptocat users. Users are given the option of independently verifying their buddies' device lists and are notified when a buddy's device list is modified and all updates are verified through the built-in update downloader.
Mozilla is a free software community founded in 1998 by members of Netscape. The Mozilla community uses, develops, publishes and supports Mozilla products, thereby promoting exclusively free software and open standards, with only minor exceptions. The community is supported institutionally by the non-profit Mozilla Foundation and its tax-paying subsidiary, the Mozilla Corporation.
LeafChat is a free IRC client for Microsoft Windows and Unix-like operating systems, licensed under the GNU GPL-3.0-or-later. A donation is requested.
Phalcon is a PHP web framework based on the model–view–controller (MVC) pattern. Originally released in 2012, it is an open-source framework licensed under the terms of the BSD License.
Keybase is a key directory that maps social media identities to encryption keys in a publicly auditable manner. Additionally it offers an end-to-end encrypted chat and cloud storage system, called Keybase Chat and the Keybase Filesystem respectively. Files placed in the public portion of the filesystem are served from a public endpoint, as well as locally from a filesystem mounted by the Keybase client.
