Salut à Toi (or SàT: "Hi to You") is an XMPP/Jabber client with multi-frontends. You can use it on a desktop (Wix), with a console interface (Primitivus), as a command-line tool (jp), or on the Web (Libervia). A plugin architecture is used to make it modular. With SàT, you can perform all the expected XMPP functions (instant messaging, multi-user chat, file transfert, etc.), but you can also use your email client (MUA) to read and send your XMPP messages, play games, do microblogging, pipe Unix command results, make scripts, etc.
The Dynamic Router Lite II project is a router project by the Dutch national police agency that allows Web-based client-control over the next-hop router for the client. A Dynamic Router Lite II system is placed as a default gateway between one or more client networks and a router network with multiple gateway-routers on it. The Dynamic Router Lite II system does policy-based routing with policy-based DNS to match the routing policy. By default a client will have no active gateway, and any attempted HTTP traffic to any domain will lead the user to the router's Web interface, where the user can then pick an appropriate next-hop router. Once picked, all traffic for the client including DNS will be forwarded to the next-hop router the user picked.
pulseaudio-mixer-cli is an interactive ncurses UI to control the volume of PulseAudio streams. It is somewhat like alsamixer, but focused not on sink volume levels (which can actually be controlled via alsamixer, with the alsa-pulse plugin), but rather on the volume of individual streams from applications, allowing the user to balance sound levels between them. Interaction with pulseaudio is done through the DBus interface, and the UI is designed to be as simple as possible, without heavy DE dependencies like GNOME libs or KDE/QT.
QuickTile is a simple attempt to duplicate the basic functionality of WinSplit Revolution for users who don't like the Compiz Grid plugin. It should work on any X11 desktop with PyGTK 2.2+, a window manager that supports the modern range of NETWM hints, and (if you want internal keybinding) python-xlib.
notification-thing is a full-featured implementation of the Desktop Notifications Specification. It is not tied to any specific desktop environment, and is focused on features like rate-limiting and flexible filtering to minimize distraction and noise ratio in a transparent way, without silently dropping anything ever.
playerdo is a script for controlling a variety of different media players from a single command line interface. It is intended to be used with keyboard shortcuts, especially the media keys (play/pause, next, etc.) found on many keyboards. It automatically detects which media player is running and tries to do the right thing.
Final Config implements the preference dialogue (typically found under Edit->Preferences) as a separate application that can be used by another application (called the client application or client) through DBus. The available preferences and how they are to be presented to the user is described in an XML file (the desc file), which can be stored in a place convenient to the client. The client does not need to bother with the desc file; it just needs to pass along the file location when invoking the FinalConfig service.