The standard for FSF source packages. This is only useful if you write your own programs or if you extensively modify other people's programs.

udev is a daemon which dynamically creates and removes device nodes from /dev/, handles hotplug events and loads drivers at boot time.

This is the default cursor theme for the KDE Plasma 5 desktop.

free chess engine derived from Glaurung 2.1. It is a chess engine, so it requires an UCI (universal chess interface) compatible GUI like XBoard (with PolyGlot), eboard, Jose, Arena or scid in order to be used comfortably. It is the strongest open source chess engine by october 2009 in the "computer chess rating list" CCRL. Written in C++ it uses multiple threads and cores. It is capable of Chess960 and has experimental support for polyglot opening books.

wkhtmltopdf is a command line program which permits one to create a pdf or an image from an url, a local html file or stdin. It produces a pdf or an image like rendered with the WebKit engine.