A lot of things can be said when trying to answer the question ‘ What makes a user interface design excellent? ‘ . Numerous fellow developers may come up with thousands of opinions and arguments, but you can bet your bottom dollar that they will all agree on this one: it’s all about appearance and usability. Now, since none of you is crazy enough to disagree with these web design basics, I’ve put together this awesome collection of free UI kits which I’m sure will be more than useful to many of you developers out there, and not only.