There are many types of user interface design through which user can communicate with each other. Design a good and impressive UI is not an easy task. It requires a lot of efforts a lot of work and many time studies.
Luckily, if you are a designer, there are many user interface design tools and user interface design tutorials that can help you create nifty and professional UI elements. On the other hand, if you are a developer and you tend to shun away from working with a graphic software, these are free UI design kits that you can grab, courtesy of some of the professional and kindhearted brethren we have from the design community.
This post rounds up a collection of 20 Free and Premium Attractive GUI Design Kits.