Command line utility for PDF viewers

PostIt (R) messages onto your X11 screen

Utility for printing an X window dump

Property displayer for X

Primitive command line interface to the RandR extension

X server resource database utility

Multi-format document reader

https://github.com/linuxmint/xreader

Refresh all or part of an X screen

Save your screen while you entertain your cat

https://www.jwz.org/xscreensaver/

WindowMaker dockapp to control XScreenSaver

https://xscreensaverapp.sourceforge.net/

W3C XML Schema to C++ translator

https://www.codesynthesis.com/projects/xsd/

Access X selection from command line

http://www.vergenet.net/~conrad/software/xsel/

User preference utility for X

Root window parameter setting utility for X

Daemon that implements the XSETTINGS specification

https://github.com/derat/xsettingsd

Japanese shodou program for X based on Tcl/Tk

https://kozos.jp/myfreesoft/

X Session Manager

Mono based web server

https://www.mono-project.com/

X standard colormap utility

Watches the growth of files or directories

https://www.unicom.com/sw/xtail/

Multi-dimensional arrays with broadcasting and lazy computing

https://github.com/xtensor-stack/xtensor

Terminal emulator for the X Window System

https://invisible-island.net/xterm/

One or two player T*tris game

Tcl/Tk-based simple TeX interface

https://www.mat.univie.ac.at/~gerald/ftp/xtexsh/

Extended ncurses version of "Renshu-cho gyoretsu"

https://saahriktu.org/games.html https://github.com/Penguinum/xtgyoretsu-forked

X version of a simple but tricky board game

Outputs X window titles

https://github.com/baskerville/xtitle

Template library that supports other quantstack projects

https://github.com/xtensor-stack/xtl

Abstract network code for X

Triangles puzzle

http://www.tux.org/~bagleyd/puzzles.html

Game of skill similar to T*tris

Avoid running into walls, your own tail, and that of your opponent

Simple version for X Window of the famous card game Super Truco

Humorous Arcade game for X

https://xtux.sourceforge.net/

X11 program that displays images of various formats

http://www.trilon.com/xv/

Opensource MPEG-4 codec, based on OpenDivx

http://www.xvid.org/

Video mode tuner for X

Throw stones into free columns

Print out X-Video extension adaptor information

Xwallpaper utility allows you to set image files as your X wallpaper

https://github.com/stoeckmann/xwallpaper

Watch a window on another X server

X11 server as Wayland Client

https://wayland.freedesktop.org/xserver.html

Run Xwayland and compositor headless

https://gitlab.freedesktop.org/ofourdan/xwayland-run

Dump an image of an X window

Window information utility for X

XWinWrap replace a desktop background with a movie or screensaver

http://tech.shantanugoel.com/projects/linux/shantz-xwinwrap

X interface tool

Classic game with apples and hungry worm

Image displayer for X

Hexdump and reverse hexdump utility from vim distribution

https://www.vim.org/