User interface design involves a lot of creativity, inspiration, testing and motivation along with the people-skills necessary to communicate effectively with clients. In a general sense, they act as symbols that allow easier and smoother communication between the webpage and the person interacting with it.
Here’s a showcase of 25 free and useful GUI Sets for your reference. While compiling this list, it’s always a possibility that I missed some other great resources. Feel free to share it with us. You may be interested in the following posts: Excellent vCard WordPress Themes, Best Advertising WordPress Plugins and Free Celtic Fonts To Download.