UBSan -- undefined behaviour sanitizer (runtime)

universal charset detection library - shared library

Unicode console input method framework - library

Portable compression library - runtime

lightweight C++ threading and sockets - shared libraries

Unicode Tokenizer - runtime

Unified Communication X libraries

libudev shared library

library to work with UDF filesystems

UDF reader library

GObject based library to access udisks2

async-capable DNS stub resolver library

UDP-based Data Transfer Protocol

Library for handling of units of physical quantities

very small Elliptic Curve Cryptography library

Lightweight event loop library for Linux

Library for high-performance, GPU-based computing - runtime

Library for high-performance, GPU-based computing - tools

Library for high-performance, GPU-based computing - data

UFP Identity library for C applications

universal hardware driver for Ettus Research products - library

HTTP web service mocking - library

High-level C++ wrapper library for libxml2/libxslt (run time)

Motif - UIL (User Interface Language) shared library

Universal Input Method - uim library

Universal Input Method - uim-custom API library

Universal Input Method - uim-scm API library

UI C++ utility library (run time)

background settings module

date settings module

default programs settings module

desktop settings module

font settings module

application settings module

interface settings module

keyboard settings module

marcogeneral settings module

implementation of the freedesktop menu specification for UKUI (library)

mouse settings module

network settings module

power settings module

print module

screensaver settings module

session settings module

Subversion check module

system information gettings module

touchpad settings module

user settings module

xkbgeneral settings module

window manager library from the Ukwm window manager