The X protocol C-language Binding (XCB) library

https://xcb.freedesktop.org/

Implementation of the XDG Base Directory specification

https://github.com/devnev/libxdg-basedir/

Various Gtk widgets for the Xfce Desktop

http://www.xfce.org/

Widgets library for the Xfce desktop environment

https://www.xfce.org/

Extension library for the Xfce desktop environment

https://www.xfce.org/

Libraries for xine multimedia player

http://www.xine-project.org/

Keymap handling library for toolkits and window systems

https://xkbcommon.org/

XKB file library

https://www.freedesktop.org/Software/xorg

Utility library to make XKB stuff easier

http://gswitchit.sourceforge.net/

XML API for C++

http://libxmlplusplus.sourceforge.net/

XML parser library for GNOME

http://xmlsoft.org/

Shared memory 'SyncFence' synchronization primitive

http://www.freedesktop.org/Software/xlibs

The XSLT C library for GNOME

http://xmlsoft.org/XSLT/

YAML 1.1 parser and emitter written in C

https://pyyaml.org/wiki/LibYAML

Library for decrypting and parsing YubiKey One-Time Passwords

https://developers.yubico.com/yubico-c/

GLib/GObject wrapper for the Skydrive and Hotmail API

https://github.com/GNOME/libzapojit

C library for reading, creating, and modifying ZIP archives

https://libzip.org/

C client interface to Zookeeper server

https://zookeeper.apache.org/

GNU ZRTP library

https://github.com/wernerd/ZRTPCPP

Routines to access raw VBI capture devices

http://zapping.sourceforge.net/doc/libzvbi/

Simple RSS/RDF feed reader

https://lzone.de/liferea/

Gnome ligthsoff

https://wiki.gnome.org/Lightsoff

Secure, fast, compliant, and flexible Web Server

https://www.lighttpd.net/

Rich city simulation game for X

http://lincity.sourceforge.net/

Digital version of Frederic Goudy's Deepdene

https://www.theleagueofmoveabletype.com/linden-hill

Lynx-like text WWW browser

http://links.twibright.com/

Lynx-like text WWW browser

http://www.jikos.cz/~mikulas/links/

Meta-port for all things CentOS 6.10

http://centos.org

Advanced Linux Sound Architecture libraries (Linux CentOS 6.10)

http://www.alsa-project.org/

OSS plugin for ALSA (Linux CentOS 6.10)

http://www.alsa-project.org/

PulseAudio plugin for ALSA (Linux CentOS 6.10)

http://www.alsa-project.org/

Advanced Linux Sound Architecture utilities (Linux CentOS 6.10)

http://www.alsa-project.org/

Spelling checker with better logic than ispell (Linux CentOS 6.10)

http://aspell.net/

Accessibility Toolkit (Linux CentOS 6.10)

https://developer.gnome.org/atk/

Libraries for Avahi (Linux CentOS 6.10)

http://www.avahi.org/

Vector graphics library Cairo (Linux CentOS 6.10)

https://www.cairographics.org/

Common UNIX Printing System libraries

https://www.cups.org/

Command line tool for transferring files with URL syntax (Linux CentOS 6.10)

https://curl.haxx.se/

RFC 2222 SASL (Simple Authentication and Security Layer) (Linux CentOS 6.10)

https://www.cyrusimap.org/sasl/

GLib bindings for D-Bus (Linux CentOS 6.10)

http://www.freedesktop.org/wiki/Software/DBusBindings

Libraries for accessing D-BUS (Linux CentOS 6.10)

http://www.freedesktop.org/Software/dbus

Linux compilers and base libraries (CentOS 6.10)

http://gcc.gnu.org/

Mesa libGL runtime libraries (Linux CentOS 6.10)

XML 1.0 parser written in C (Linux CentOS 6.10)

https://github.com/libexpat/libexpat

Free lossless audio codec (Linux CentOS 6.10)

https://www.xiph.org/flac/

XML-based font configuration API for X Windows (Linux CentOS 6.10)

https://www.freedesktop.org/wiki/Software/fontconfig/

Graphic library for GTK+ (Linux CentOS 6.10)

https://developer.gnome.org/gdk-pixbuf/

Mesa GLX utilities (Linux CentOS 6.10)

https://www.centos.org/

GNU Transport Layer Security library (Linux CentOS 6.10)

https://gnutls.org/

GTK+ library, version 2.X (Linux CentOS 6.10)

http://www.gtk.org/