X Session Manager

Mono based web server

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

X standard colormap utility

Watches the growth of files or directories

http://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

Japanese text formatting processor

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

Fast and functional image viewer

https://github.com/linuxmint/xviewer

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

X Clients under Wayland

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/

Extremely fast non-cryptographic hash algorithm

https://cyan4973.github.io/xxHash/

XKB keyboard layout indicator and switcher

https://sourceforge.net/projects/xxkb/

Puzzle games like sokoban or boulderdash

https://xye.sourceforge.net/

Infocom game interpreter that runs under X11

https://www.eblong.com/zarf/xzip.html

Magnify, rotate, mirror the image on the X screen

Yet another Basic for Unix and Windows

http://www.yabasic.de/

Original free open-source forum written in Perl

http://www.yabbforum.com/

Display GNOME dialogs from the command line

https://github.com/v1cont/yad

Yet another FTP client, similar to ftp(1)

http://www.yafc-ftp.com/

Yet Another File Integrity Checker, similar to Tripwire

http://philosophysw.com/software/yafic/

Curses version of the dice game for one or more players

Portable JSON parsing and serialization library in ANSI C

http://lloyd.github.com/yajl/

Enhanced execution box with regex pattern matching

http://offog.org/code/

YAML parser and emitter in C++ matching the YAML 1.2 spec

https://github.com/jbeder/yaml-cpp