Showkeys is a simple program to display keys being pressed on the screen. It is useful while making presentations and screencasts. The audience will be able to see the keys being pressed. It is similar to key-mon. Key-mon has more features than showkeys. but the latter solves some specific problems: it doesn't use GTK/GNOME; uses libxosd to display keys directly onto the screen; has no floating windows to that always need to be on top (which is very useful if you're using a tiling WM like Xmonad); and has keystroke history. key-mon has keystroke history, but doesn't show modifiers. showkeys does, using an Emacs style key notation.
Xiwtool simplifies connecting a Linux computer's wireless card to a nearby Wireless Access Point. It allows anyone to browse nearby networks and can help you configure a Linux machine to connect to a WAP. It is compatible with any Linux system with a graphical desktop and wireless card, and can configure wireless connections on most systems which use ifup and ifdown to connect to the Internet.
Wnotes are small, self-contained text notes for X Window System desktops. You can create, type, cut-and-paste, and save notes in any combination you like. Wnotes let you store notes and their window configurations using any database which accepts input from the Unix shell. It is compatible with most Linux and Unix desktops. The source code package includes sdb, a simple note database written as a bash script, and other examples of how to use Wnotes.
xlife is a laboratory for experimenting with cellular automata. It supports loadable rulesets and palettes, different topologies, and up to 256-state cellular automata. It has rules and patterns for Life, Brian's Brain, Perrier's Loops, Langton's Ants and Loops, Wireworld, E.F. Codd's 1975 UCC automaton, some Prisoner's Dilemma games, and many others. It is very fast for step-by-step mode, bounded grid, and chaotic patterns. It has several unique features: a historical mode, a pseudocolor mode, and n-state statistics. It has been developed since 1989. The modern version of Xlife began its history in 2011.