In the world of internet, you can always find what you need as someone has already created something that fulfill your requirements. On top, if your required element is available for free then who would want to waste time designing something that ultimately churns out to be almost identical to what that has already present in the World Wide Web?
Keeping this in mind, designers develop free downloadable Web UI elements so that their fellow designers can use them or take help from them. In this way, designers can better spend their time and efforts in creating something new and totally unique rather than creating a replica of someone else work. Below are more than 35 free UI element packs from a variety of designers. Enjoy!
Transparent Glass UI: Free PSD for User Interface Design
Freebie: Modern UI Pack Photoshop PSD
Soft UI Kit: Free PSD for Mocking Up Web Designs