When building a web app it's important to keep in mind how much of it's success is built on having a thoughtfully designed, well laid out and instantly usable user interface. A bad UI can ruin an otherwise fantastic app, and can cause more people to abandon it. Of course, the opposite is true too - great UIs can encourage use, and can mean more sales and more people talking about and sharing your app.
But designing a user interface is also a lot of work. Drop-down menus, radio buttons, checkmarks and form fields can all be fiddly and challenging to get right, and can often take a huge amount of time to design properly. You can - however - cheat, by using a beautifully designed UI kit right from the start. UI kits won't automatically make your app usable - you'll need to think about how everything is located and accessed by users first - but it's a good start and can help to get you up and running with a beautiful design quickly. We've brought together a showcase of beautifully crafted, free and expertly designed UI kits to help you on your way with producing a great user experience.
Are there any examples of beautifully designed, creative and useful UI kits that you've found that deserve a mention? Please do let us know in the comments.