Similar to WebSocket

Typepad

.ua

.ug

.uk

Urchin (software)

.uy

.uz

.vc

.ve

.vg

Visual.ly

.vn

.vu

Vyatta

VyOS

Web Accessibility Initiative

Web application firewall

Web Proxy Auto-Discovery Protocol

Web GIS

Webmention

.wf

WHATWG

Wikirage