TUG (TeX Users Group): http://www.tug.org/
TV5: http://www.tv5.org/
Ubibooks: http://www.ubibooks.com/
UBL (Ultimate Band List): http://www.ubl.com/
Ubuntu: http://www.ubuntu.com/
UC (University of California) Berkeley: http://www.berkeley.edu/
UCLA (University of California, Los Angeles): http://www.ucla.edu/
UCLA Online Institute for Cyberspace Law and Policy: http://www.gseis.ucla.edu/iclp/hp.html
UIT (Union internationale des télécommunications): http://www.itu.int/home/index-fr.html
UIT: Termite (Terminology of Telecommunications): http://www.itu.int/terminology/index.html