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/

Save your screen while you entertain your cat (for GNOME users)

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

Save your screen while you entertain your cat (for GNOME users)

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

WindowMaker dockapp to control XScreenSaver

http://xscreensaverapp.sourceforge.net/

Access X11 selection buffer from command line

http://BSDforge.com/projects/x11/xsel/

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

X Session Manager

Mono based web server

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

Utility for monitoring keystrokes on remote X servers

http://www.acm.vt.edu/~jmaxwell/programs/xspy/xspy.html

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/

Tcl/Tk-based simple TeX interface

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

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

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

Fast and functional image viewer

https://github.com/linuxmint/xviewer

Print out X-Video extension adaptor information

X Clients under Wayland

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

X11 server as Wayland client (development snapshot)

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

Dump an image of an X window

Window information utility for X

Image displayer for X

Extremely fast non-cryptographic hash algorithm

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

XKB keyboard layout indicator and switcher

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

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/

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/

Package manager for node, alternative to npm (meta port)

https://classic.yarnpkg.com/

Package manager for node, alternative to npm

https://classic.yarnpkg.com/

Package manager for node, alternative to npm

https://classic.yarnpkg.com/

Package manager for node, alternative to npm

https://yarnpkg.com/blog/

Package manager for node, alternative to npm

https://classic.yarnpkg.com/

Package manager for node, alternative to npm

https://classic.yarnpkg.com/

Default GTK theme for Ubuntu

https://github.com/ubuntu/yaru

Default icon theme for Ubuntu

https://github.com/ubuntu/yaru