xine is a free multimedia player. It plays back CDs, DVDs, and VCDs. It also decodes multimedia files like AVI, MOV, WMV, and MP3 from local disk drives, and displays multimedia streamed over the Internet. It interprets many of the most common multimedia formats available--and some of the most uncommon formats, too. All those features come in a reusable library (xine-lib) which can easily be embedded in your applications.
xlayout is a terminal-based utility to get and set information about X11 windows and the pointer. It's designed to be easily integrated into bash shell scripts and takes advantage of the X11 protocol to allow it to access remote X11 desktops. With the aid of the libease library, xlayout provides the ability to smoothly ease the windows and pointer into position.
xmcd2make is a set of Perl scripts which support users of the gramofile recording, track splitting, and signal processing package. It consists of 3 userland tools: findtracks.pl (a command line interface to gramofile track detection), signalproc.pl (a command line interface to gramofile track splitting and signal processing), and xmcd2make.pl (a script that takes an xmcd file of song names and track timing files and creates a makefile). When the makefile is run, it splits the tracks, performs gramofile signal processing, and encodes the resulting tracks to Ogg Vorbis format with the correct song names and good tags.
xmdb is a collection of programs that calculate and display Mandelbrot sets using X11. This package includes sources for mcalc, xmdisp, and mxwd. mcalc does the calculations and writes a datafile. xmdisp reads the datafile and produces an X11 display that contains a fractal picture. mxwd reads the datafile and writes an X Window dump (xwd) format file which can be read by xwud and xpr.