XML parser for Java

http://xerces.apache.org/xerces2-j/

Displays the current CPU clock frequency in the panel

https://github.com/riggs-/xfce4-bsdcpufreq-plugin/

D-Bus-based configuration storage system

http://www.xfce.org/projects

Graphical representation of the disk IO

https://docs.xfce.org/panel-plugins/xfce4-diskperf-plugin/start

Visually-appealing notification daemon for Xfce

http://goodies.xfce.org/projects/applications/xfce4-notifyd

Power manager for the Xfce Desktop

http://goodies.xfce.org/projects/applications/xfce4-power-manager

Xfce window manager

http://www.xfce.org/

Xfce 4 window decoration themes for xfwm4

http://www.xfce.org/

Read-only FUSE server implementing XFS

https://github.com/KhaledEmaraDev/xfuse

W3C's Modularization of XHTML DTDs and docs

https://www.w3.org/TR/xhtml-modularization/

Replacement for inetd with better control and logging

http://www.xinetd.org/

Convert an XML file into C struct/string declarations

https://acme.com/software/xml2c/

XML character entities

http://www.oasis-open.org/docbook/xmlcharent/

XML Security Library

http://www.aleksey.com/xmlsec/

XMPP client with OTR support

https://github.com/agl/xmpp-client

Cross-platform libraries and tools for NVMe devices

https://xnvme.io/

Python-ish BASH-wards shell

https://xon.sh

X.org fonts meta-port

http://www.x.org/

X.Org 100dpi bitmap fonts

http://www.x.org/

X.Org 75dpi bitmap fonts

http://www.x.org/

X.Org Cyrillic bitmap fonts

http://www.x.org/

X.Org miscellaneous bitmap fonts

http://www.x.org/

X.Org TrueType fonts

http://www.x.org/

X.Org Type1 fonts

http://www.x.org/

X.org libraries meta-port

http://www.x.org/

Graphical performance meter

https://www.pogo.org.uk/~mark/xosview/

Command line utility for PDF viewers

Daemon that implements the XSETTINGS specification

https://github.com/derat/xsettingsd

Multi-dimensional arrays with broadcasting and lazy computing

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

Extended ncurses version of "Renshu-cho gyoretsu"

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

Template library that supports other quantstack projects

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

Opensource MPEG-4 codec, based on OpenDivx

http://www.xvid.org/

Hexdump and reverse hexdump utility from vim distribution

https://www.vim.org/

Yet another Basic for Unix and Windows

http://www.yabasic.de/

Yet another FTP client, similar to ftp(1)

https://github.com/sebastinas/yafc

Portable JSON parsing and serialization library in ANSI C

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

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

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

Simple command line tool for formatting yaml files

https://github.com/google/yamlfmt

Use Yandex DNS as a dynamic DNS provider

https://github.com/thekvs/yandex-ddns

Malware identification and classification tool

https://virustotal.github.io/yara/

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://classic.yarnpkg.com/

POSIX-compliant command line shell

https://magicant.github.io/yash/

Utilities to help manage documentation for Yelp and the web

https://wiki.gnome.org/Apps/Yelp/Tools

DocBook XSLT stylesheets for yelp

http://www.gnome.org/

SMT solver

https://yices.csl.sri.com/ https://github.com/SRI-CSL/yices2/

Convert between YAML, TOML, JSON, and HCL

https://github.com/sclevine/yj

Command line tool that converts YAML to JSON

https://github.com/bruceadams/yj

Library and tool for personalization of Yubico's YubiKey

https://developers.yubico.com/yubikey-personalization/