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That's usually just done with the code of the website.
Either a redirect or selecting different style sheets depending on the User Agent. I'm guessing @Soul wants to force users of his own site to specific versions of other sites depending on what device they are using. Seems like a fools errand because, as you say, the sites which do a passable job of varying their output for mobile also generally do a decent job of picking which version to serve based on the User Agent.
Anyone aware of a tool that allows you to use one link / URL and then have that link redirect a user based on their platform (desktop / mobile)?
i.e
Displayed link: http://www.bbc.co.uk
User A (Desktop) clicks through to: http://www.bbc.co.uk
User B (on mobile / tablet) clicks through to: http://www.bbc.co.uk/mobile