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A simple software defined radio (SDR) library. Although being simple, libsdr is sufficient to write a simple SDR receiver application (github.com/hmatuschek/sdr-rx, above). This RX application supports several input sources (i.e. sound card, files, RTL2382 dongles etc.) and modes (i.e. AM, FM, SSB, CW, etc.).

XJump (aka 'FALLING TOWER') is a cool game based on simple X graphics where the object is to get the player up as many levels as possible. Quite possibly one of the most addictive games out there.

xbindkeys is a program that allows you to launch shell commands with your keyboard or your mouse under X Window. It links commands to keys or mouse buttons, using a configuration file.

VNC stands for Virtual Network Computing. It is, in essence, a remote display system which allows you to view a computing 'desktop' environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures.

XRally is a Linux clone of the classic Rally X arcade game. For those who don't know, in Rally X you control a blue (good) car, that has to collect yellow flags around a maze-like map, while avoiding the red (bad) cars. In order to help himself, the blue car can use clouds of smoke through the maze. If a enemy touch any of these clouds, it stops for a while. The enemy cars can also crash one with the other, what gives you some extra time. XRally is written in C using only the basic Xlib and Xpm libraries. It's a project aimed mainly at newbie X11/Game programmers like me (but any experienced help is appreciated! :) )

Aview is powerful graphics viewer which utilize the aalib API and allows viewing netpbm format (and others in the presence of netpbm or ImageMagick) on console (using slang) and X. There are three programs. aview: the main program which could used to view pnm, ppm, pgm and pbm files. It runs under X or slang. asciiview: a shell script wraps around aview to allow wider range of image formats to be viewed. Netpbm package is required for the conversion. aaflip: a program to view flip animation using ascii text. Works under X and slang. You could press h to get help. You may also save the pics in various text format. Thanks to aalib!

Pango is the text rendering engine of GNOME 2.x. SDL_Pango connects the engine to SDL. If you are a game software developer, you should know the difficulties of distribution. So I will start to introduce SDL_Pango from the viewpoint of distribution. In Un*x, SDL_Pango is hard to use as system-independent module, because it depends on fontconfig and Pango which are designed as system-singleton modules. If you use SDL_Pango, your software will require those modules installed to target system. If your software is shipped as shrink-wrap package, it may cause much problem on your support desk. You should carefully design your installation process.

XBellD is a small daemon for replacing the standard X Window System terminal bell with a more interesting set of sounds. This is useful for systems where the terminal bell is handled by the "PC Speaker," or where different sounds are desired for different classes of X clients. XBellD works by intercepting terminal bell requests on the server side, and then playing user-specified sounds through a PCM capable soundcard. The resource class of the client making a terminal bell request is used to match a corresponding sound file which should be played when such a request is made.

xtris is a version of an classical popular game, for any number of players, for the X Window system. xtris is a true client/server game (as opposed to a centralized game managing multiple displays), which makes it particularily responsive and bandwith-effective.

This is the part of X11R3's xcalc(1) utility that features a historic Slide Rule. This is not taken to be too serious, it's merely a little fun project for those people who have learned their basics of mathemat- ics and logarithms by using such a nice ``pocket calculator''. The original xcalc is from John Bradley, and Mark Rosenstein. A number of bugs and inaccuracies fixed by Joerg Wunsch.