climm (CLI-based Multi-Messenger) is a portable, small, yet powerful console-based ICQ and XMPP 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. climm was formerly known as mICQ.
Tsung is a distributed load testing tool. It is protocol-independent and can currently be used to stress HTTP, WebDAV, PostgreSQL, MySQL, LDAP, AMQP, and XMPP/Jabber servers. It simulates user behavior using an XML description file, reports many measurements in real time (statistics can be customized with transactions, and graphics generated using gnuplot). For HTTP, it supports 1.0 and 1.1, has a proxy mode to record sessions, supports GET, POST, PUT, and DELETE methods, cookies, and basic/digest authentication. It also has support for SSL, WebSocket, and BOSH.
Help Center Live strives to be the best on-line customer service application available. The modular construction allows add-ons to be crafted for most any situation. HCL has a strong following due to its speed and robust capability. Current goals are to enhance administration and further enhance the module system of HCL, to bring it to the forefront of live CRM.
IM-Filter is a daemon that runs on a firewall and filters ICQ traffic. The daemon can identify file transfers, handle UIN and word blacklists, manage a list with currently logged in users, and log messages sent via the ICQ protocol. The modular design allows implementation of other protocols like MSN or IRC.
irssi-xmpp is an irssi plugin to connect to the Jabber network. It aims to provide good integration in this text-based IRC client. It can send and receive messages in irssi's query windows. A roster is shown for tracking contacts' resources. Contacts can be managed. Command completion, multiple accounts (in different connections), Unicode, and SSL are supported.
Fama IM is a project to build an easy to use, powerful instant messaging software built on the Flexible Communications Framework, Telepathy. The interface is text-based and built upon the ncurses library, hence you run it in your favorite terminal emulator or directly in the console.
MiniIM is multi-protocol instant messaging client. It is based on J2ME and thus targets the MIDP2 supported platforms (commonly found in the mobile devices). It is inspired by the popular Pidgin (Gaim) program. The design is concentrated on the protocol level abstraction and an easy way to integrate new protocol implementations. The interface design is unaware of the underlying protocols.