url(_uri_) - man - phpMan

curl (1)             - transfer a URL
curl-config (1)      - Get information about a libcurl installation
Digest::MD5::File (3pm) - Perl extension for getting MD5 sums for files and u...
duck (1)             - the Debian Url ChecKer
lwp-dump (1p)        - See what headers and content is returned for a URL
LWP::MediaTypes (3pm) - guess media type for a file or a URL
Net::OpenID::URIFetch (3pm) - fetch and cache content from HTTP URLs
Net::OpenID::Yadis (3pm) - Perform Yadis discovery on URLs
open (1)             - opens a file or URL in the user's preferred application
svnmucc (1)          - Multiple URL Command Client for Subversion
svnpath (1)          - output svn url with support for tags and branches
Template::Plugin::URL (3pm) - Plugin to construct complex URLs
uri (7)              - uniform resource identifier (URI), including a URL or URN
URI::URL (3pm)       - Uniform Resource Locators
url (7)              - uniform resource identifier (URI), including a URL or URN
urn (7)              - uniform resource identifier (URI), including a URL or URN
WWW::Curl (3pm)      - Perl extension interface for libcurl
xdg-open (1)         - opens a file or URL in the user's preferred application
XML::RPC::UA::Curl (3pm) - XML::RPC useragent, using Curl