Jabbim is a client for communication over XMPP/Jabber protocol, written in the Python language using Qt (4.3), PyQt (4.3) and Pyxl library, which is a part of the client. The aim of the Jabbim client is to make Jabber approachable for common people, so it is a client for common users and beginners. Because of this philosophy the Jabbim client might not suit everyone.

VMware is offering a free (LGPL-licensed) client for use with its VDI (virtual desktop infrastructure) thin client technology. The VMware View Open Client lets users access personalized, data center-hosted desktops from "almost any" device, VMWare claims.

The NIS Server-Client relationship requires that you set up a client in order to work with the NIS server. This will enable you to login on the client from a user and password located on the database of the NIS server. The client machine will first look in the /etc/passwd file and then check the database on the NIS server.

So finally I know who had the idea of client side decorations: it’s Canonical. Why didn’t I think of it before? I have been aware of the fact that GTK wants to do client-side window decorations since it was mentioned on the EWMH mailinglist and I think it is a completely stupid idea which has the potential to destroy one of the most important advantages of the free desktop...

Many people use BitTorrent clients to download popular movies, music, and television shows for free...In order to download the files associated with torrents, you need a BitTorrent client. KTorrent, a KDE project, is a feature-rich client that is completely self-contained from the moment you start searching for torrents until the last chunk finishes downloading.

Google has released a preliminary software development kit for Native Client, its native-code browser plug-in. The company unveiled its Native Client SDK "developer preview" with a blog post on Wednesday, calling it "an important first step in making Native Client more accessible as a tool for developing real web applications."

Client configuration can be just as big of problem as the set up for the server. One of the problems is that not all clients, both Linux and Windows, are capable of handling TLS or SMTP AUTH. That is getting better but it is still a problem. One great alternative client is Thunderbird, Icedove if you are on Debian.

KMail, KDE’s email client, is a robust and still very popular choice for those who still prefer to have their emails on their desktop, even when they are offline. It is part of the Kontact PIM (Personal Information Management) suite and offers many useful and unique features. Among those features is the ability to create advanced email templates.

ChatZilla is an IRC client built as a Firefox add-on and providing enough features to use it just like any other standalone IRC client. ChatZilla will fit best as an IRC client when you don't want to use a separate application for getting on IRC.