Free instant message clients software for linux

Messa is an instant messager client and server. The client has a curses interface and works on the console.

Messa project supports multilingual messages and private messages. The server supports monoprocess operation (without threads), the ability to choose the listening port, and the ability to run under the console.

cintoo Messages is a framework to make internationalization easier for Java applications. cintoo Messages framework supports locales for threads, and bundles can be associated with different packages.

This allows the usage of different bundles for different parts of the application, such as plugins, an installer, or a logging system. Bundles can be managed and associated with packages without any changes in the code.

This makes bundle management and refactoring much easier than with other solutions. cintoo Messages supports global locales for client applications written in Swing or SWT and thread-local ones for serverside Web applications.

Example:

Messages.setBundle("myBundle", "only.for.this.package");
...
Messages.setThreadLocale(new Locale("en", ""));
...
Messages.format(this, "myKey");

Jabber is an instant messagings system (and a few other things but Ill forget about these for the moment), but it uses XML so its easy to create clients for it, and to link it in with other systems.

As well as that anyone can run a Jabber server, so youre school, university or office could have their own messaging system.

Avis client library is a Java API for clients accessing Elvin event routers, including the open source Avis event router and the commercial Mantara Elvin product.
Avis is an event router service compatible with the commercial Elvin implementation developed by Mantara Software. Avis provides a fast, general-purpose publish/subscribe message bus.
Elvin event routers alllow arbitrary messages, known as notifications, to be exchanged via a publish/subscribe model. Elvin clients subscribe to messages published by other clients using expressions that match messages by their content.
The content-based routing approach used in Elvin routers differs from many other message bus systems that operate by selecting messages published on pre-defined channels, and has the advantage of promoting a much higher level of decoupling between producers and consumers of events.
The name "Avis" derives from the French word avis, meaning advice or notification.
Enhancements:
- This release marks a stable baseline for the Java client API.
- The core set of features required for an Elvin client library are now implemented and stable, including subscription, notification, security, close event notification, liveness checking, and router connection option support.

Yahoo! Messenger for Unix sends instant messages to your Windows and Unix friends!
Enhancements:
- Improved Emoticons - Improved Message Archive - Improved sound on RedHat kernels - Yahoo! Address Book integration - File transfer with Windows clients -

OpenChange project intends to provide an implementation of Microsoft Exchange under Unix platforms.
Gnome Evolution is a powerful messaging client which offers several features but do not yet have native Exchange protocols support. This plugin extends Gnome Evolution, provides interoperability with Microsoft Exchange servers and aims to provide a messaging client with most of the common features Microsoft Outlook users are dealing with on a daily basis.
Main features:
- Exchange account setup
- Fetch emails
- Send emails
- Delete emails
- Fetch and send attachments
- Handle Message flags (attachments and importance)
- Display light mailbox folder hierarchy
Enhancements:
- This experimental release provides exchange account setup using the Evolution account wizard.
- It can fetch, send, and delete email messages with or without attachments. Message flags (attachment, importance, read/unread) are supported.
- A light mailbox folder hierarchy is provided.

JWChat is a full featured, web-based Jabber client. It uses only JavaScript and HTML on the client-side. It supports basic jabber instant messaging, roster management and groupchats based on the MUC protocol.
JWChat is an advanced instant messenger (IM) just like AIM, MSN Messenger, Yahoo! Messenger or ICQ. This means you can manage your contacts, communicate with other users in 1:1 chat sessions or join a groupchat room for collaborative communication. Unlike other IMs you can use this with your web browser without having to install any additional software at all. For a list of supported browsers see the features page.
All of your settings, bookmarks and your contact list are stored on the server side. This means that you have access to your personalized client from almost any computer as long as its got access to the internet.
JWChat and its underlying software are all Open Source. This gives you the flexibility you need in your everyday business.
JWChat brings you the perfect solution for your corporate communication. Being a web application it gives you all advantages of centralized software distribution. Dont hassle with software installs and updates on the client side!
As a web developer its easy for you to integrate it with your existing web projects. Add advanced instant messaging and groupchat functionality to your website now!
Main features:
Jabber/XMPP
- Create accounts
- Roster management: Add, delete contacts, edit contacts groups etc.
- Jabber presence types with support for away messages
- Custom presence for each roster item
- Instant Messages and 1:1 Chats
- Support for registering and searching JUD (Jabber User Directory)
- Full support for MUC (Multi-User Chats) as described in JEP-0045
- Support for transport/gateways to other IM services like ICQ, AIM, MSN, etc.
- Server side storage of preferences and bookmarks (chat rooms)
- Message-History (optional - needs support from the server side)
- many more
GUI
- Multiple language support (through apaches mod_negotiation)
- Online-Help
- System sounds
- Smileys in messages and chats (themes customizable)
- Customizable poll interval (if polling backend present)