Free instant messaging platform software for linux

simple instant messaging (sim) is an IRC client specialized for use with bitlbee. It is based on sic (http://suckless.org). It reads commands from standard input and prints all server output to standard output.
simple instant messaging also multiplexes all channel traffic into one output, so you dont have to switch to different channel buffers. sim must be customized by editing its source code to insert the correct username, server, password, and identification information.
Enhancements:
- The command operator was changed.
- Some code simplifications were done.
- The output format was adjusted.

SIM Instant Messenger provides an plugins-based instant messenger with support for various protocols.
Based on the Qt library it works on X11 (optional with KDE-support), MS Windows and MacOS X.
Main modules
- Core (_core) is the program interface
- Migrate (__migrate) Converts the old SIM 0.8.3-settings to the new 0.9x format
- Homedir (__homedir) sets the configuration-directory
Protocols modules
All protocols support richtext-messages, file transfer, typing notification, server-side contact list (with postponed synchronization - you can change contact list in offline mode and after log on all changes will be synchronized with server), new account registration, various searches and HTTP-polling.
You can use multiple accounts for each protocol.
- Oscar - ICQ and AIM support
- Jabber
- LiveJournal
- MSN
- Yahoo!
Enhancements:
Build system
- Autotools: fix libXss detection.
- Add initial CMake support.
Core
- Disable history filter when it is empty.
- Remove "To container" menu when separate containers are disabled.
- Auto scroll message view only if it is scrolled to the bottom.
- XFree: fix problems with Composite extension enabled.
ICQ plugin
- More fixes for receiving certain messages.

Secure Messaging is a Web-based, alternative mail system for sending and receiving messages.

Use secure messaging to send and receive messages from a alternative web-based mail system. Using the secure messaging system no actual mail is transmitted through any 3rd party servers.

Only an optional message notice is sent to the recepient, the user needs to visit the site in order to read the message.

Normal SMTP mail can hit multiple servers and can possibly be read, stored, or changed anywhere within the process.

Setup secure messaging on an SSL enabled website to enhance the privacy even more.

Lua Messaging Engine (LuME) is a set of scripts that offer abstract functions for communication via AOLs OSCAR protocol (as used by ICQ and AIM clients), Microsoft Messengers MSNP, and Yahoos YIM protocol. Lua Messaging Engine also includes utility functions for string operations, SHA hashing, and basic HTTPS communication.

An increasing number of software developers are making use of the simplicity and power behind employing a Lua script interface.

Meetroduction, LLC has been using a Lua script interface as a core design concept for the multi protocol messaging component of its proximity based people finder client: Meetro. Beyond that, the interface offers its users a flexible way to vastly extend the clients functionality.

Off-the-Record Messaging is a Pidgin plugin that allows you to have private conversations over instant messaging by providing:
Encryption
No one else can read your instant messages.
Authentication
You are assured the correspondent is who you think it is.
Deniability
The messages you send do not have digital signatures that are checkable by a third party. Anyone can forge messages after a conversation to make them look like they came from you. However, during a conversation, your correspondent is assured
the messages he sees are authentic and unmodified.
Perfect forward secrecy
If you lose control of your private keys, no previous conversation is compromised.
Enhancements:
- Translations for English, Dutch, Spanish, French, Slovak
- Added option to not log OTR conversations
- Large messages are now fragmented transparently instead of failing
- Removed "view secure session id" and "verify fingerprint" options from the OTR button menu. Added "authenticate buddy" option in its place. This new option allows you to authenticate your buddies by entering some secret that only the two of you know, rather than by using a long user-unfriendly sequence of hex characters. [The old "verify fingerprint" dialog is still available via an "Advanced..." button from the new "authenticate buddy" dialog.]

Yafumato Web Messenger is a Web-based instant messenger client. Users can connect to supported instant messenger services using only a Web browser via HTTP (or HTTPS).
The Yafumato server connects to the messengers by proxy and provides the Web interface to the user, allowing instant messaging from computers where a desktop client cannot be used.
Yafumato Web Messenger is currently alpha software; as such, it has minimal error handling and is not feature complete.
Enhancements:
- The database is now an optional package; users can now login using messenger credentials rather than single sign-on using the database.
- Messenger session handling has been improved; any active messenger sessions are restored upon signin.
- Unstable messenger sessions can be disconnected and replaced using the new "Reset Messenger" link on the status page.

A miniature console based AIM client written in pure Java. It implements the TOC protocol and provides a solid framework for understanding and writing your own IM clients or bots. Project SimpleAIM is an open source development project aimed at providing platform independence and interoperability in the realm of instant messaging services.

This document describes the TOC protocol. The protocol is built on TCP. Framing is done by SFLAP, described at the bottom of this document. Inside each
SFLAP frame is a TOC command.

The TOC protocol is ASCII based, and special attention must be placed argument separation. The separator and the rules of separation are different for messages inbound
to TOC and outbound to the client. The rules of separation are described in sections below.

The TOC server is built mainly to service the TIC and TiK clients. Since the TIC client is a Java applet, and downloadable, TOC will NOT support multiple TOC protocol versions at the same time. Therefore, TiK users will be forced to upgrade if the protocol version changes.
TOC sends down the protocol version it expects the client to speak and understand. Note, the protocol version is a string.

PCLinuxOS project is one of the worlds up and coming providers of a Linux Desktop Solution. With a small but dedicated development team, PClinuxOS delivers Desktop Ready Software that harnesses the power of the Open Source Community.
Enhancements:
- PCLinuxOS 0.93a Junior is a self booting Live CD with advanced hardware detection. In addition to running Junior in Live CD mode, you can also install it to your computer. Easy to follow instructions are included on the Live CD as well as a chat channel for instant help. Junior comes with a set of pre-selected programs for web browsing, email, instant messaging, blogging, IRC chat, music, graphics, video, digital camera, games, FTP, BitTorrent transfer, CD/DVD burning and more.