Spackle is designed to be a flexible client/server architecture for the gathering and displaying of statistics, primarily suited to monitoring servers. It's written in PHP and bash shell script, uses RRDtool for stats logging and graphing, and PostgreSQL or MySQL for the server-side database.
AbulÉdu is a Ubuntu-based distribution for primary schools. It is currently in French but most of the tools can be translated. An AbulÉdu server can handle Mac, Windows (samba), GNU/Linux and X terminal (with LTSP) clients. The server acts as a central gateway for Web, mail, and printing, and facilitates the management of classes, pupils, and teachers. Everybody can publish Web pages on an intranet using Apache and all administration tasks are performed using a browser. The result is that a teacher who is not a computer specialist can install and manage a school network.
PicoGUI aims to be a complete GUI environment for handheld computers and other embedded systems. It uses a client/server model, like the X window system, but while an X server is given raw drawing commands, the PicoGUI server integrates a widget set, making PicoGUI clients small and efficient. PicoGUI also has the goal of allowing client/server connections over a variety of mechanisms. It is most commonly used with Linux, but is designed to be portable to any OS. PicoGUI has a variety of video and input drivers which allow it to interface with the Linux framebuffer device, SDL, the X window system, and several other devices.