Opensourceinfo

Coccinella is a Jabber client with a whiteboard. The whiteboard is a shared desktop which supports text, drawings, images, and multimedia in a number of formats, such as MP3 and video. It runs in two main modes, a peer-to-peer configuration and a mode compatible with the Jabber Instant Messaging system. A flexible plugin architecture may be used to support additional formats. It should run on any machine that runs Tcl/Tk.

ejabberd is a multi-platform, scalable, distributed, and fault-tolerant XMPP Jabber server. Moreover, it supports several advanced features such as multi-user chat, IRC transport, publish and subscribe services, Jabber user directory, a Web-based administration interface, an HTTP polling service, SSL and TLS support, LDAP and external authentication.

The goal of Gajim is to provide a full featured and easy to use Jabber client. Gajim works nicely with GNOME (written in PyGTK), but does not require it to run.

GnomeICU is a Gnome application which allows one to communicate with other GnomeICU users or others who use ICQ (Windows, Java, Mac, etc). With GnomeICU, one can send and receive messages, change online modes, send and receive URLs, and much more.

GNU Gadu is a modular instant messaging client with a GUI written in GTK2. It currently supports Gadu-Gadu, Tlen.pl, and Jabber. It is able to load Perl scripts, dock in several window managers, play sounds, talk to other programs via a UNIX socket, send SMS messages to Polish GSM operators, automatically check for updates, and use XOSD for displaying notices.

jabberd is a Jabber/XMPP instant messaging server. It implements most of XMPP (RFC3920), XMPP-IM (RFC3921) and a range of protocol extensions (JEP-0011, JEP-0012, JEP-0022, JEP-0023, JEP-0030, JEP-0049, JEP-0054, JEP-0077, JEP-0078, JEP-0086, JEP-0090, JEP-0091, JEP-0092, JEP-0094, and JEP-0114).

KMess is a MSN Messenger client for Linux. It enables Linux users to chat with friends online who are using MSN Messenger in Windows or Mac OS. The strength of KMess is it's integration with the KDE desktop environment, focus on MSN Messenger specific features and an easy-to-use interface.

Kopete is an instant messenger supporting AIM, ICQ, MSN, Yahoo, Jabber, IRC, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and extensible multi-protocol system suitable for personal and enterprise use. The goal of Kopete is to provide users with a single easy-to-use way to access all of their instant messaging systems. The interface puts people first, and is integrated with the system address book to let you access your contacts from other KDE applications. IM can be intrusive, but Kopete's notification system can be tuned so that only important contacts interrupt you.

mcabber is a small Jabber console client. mcabber includes features such as SSL support, MUC (Multi-User Chat) support, history logging, commands completion, and external actions triggers.

mICQ (Matt's ICQ Clone) is a portable, small, yet powerful console-based ICQ client. It supports password changing, auto-away, creation of new accounts, and other features that makes it a very complete yet simple client. It is able to send and receive messages from the ICQ network, list users that are offline and online (including their online status), search for users by email address, and look up basic (name, UIN, email) information.

naim is the original ncurses (console) AIM client, which also supports IRC, ICQ, and Lily CMC. For AIM and ICQ, it uses the TOC protocol, and includes many commonly-requested features found nowhere else, while still preserving naim's classic look and feel.

Pidgin is a GTK2-based instant messenger application. It supports multiple protocols via modules, including AIM, ICQ, Yahoo!, MSN, Jabber, IRC, Napster, Gadu-Gadu and Zephyr. It has many common features found in other clients, as well as many unique features. Pidgin is not endorsed by or affiliated with AOL TimeWarner, Microsoft, or Yahoo.

Twinkle is a software phone for voice over IP communications using the SIP protocol. You can use it for direct IP phone to IP phone communication, or in a network using a SIP proxy to route your calls. Some of the features offered are call waiting, call hold, 3-way conference call, call transfer, and call reject. It supports STUN or a statically configured public IP address for NAT traversal. When using STUN, it will send keep-alive packets to keep NAT bindings alive.

YSM (You Sick Me) v7 is an ICQ console client. It was originally meant to run in Linux, but it has been successfully tested in Linux, BSD, Win32, BeOS, and QNX. The client requires no extra libraries, and is written in the C language. YSM is based on the last ICQ protocol version, v7/8.