A web designer will inevitably spend endless hours mocking up web pages and trying to come up with a good result, so these already made UI elements are a must-have because they can help him save precious time.  In this article I have collected 25 user interface elements which are completely free and also very cool. All the elements are in .psd format and can be found on some of my favorite freebie websites.

Lion UI Kit

Lion UI Kit is a handy PSD mockup tool with fully layered and editable elements from the latest OS X operating system.

Multi-coloured Buttons

Sleek UI Elements

Whether you’re creating a website or mobile app, well designed UI elements are key to a good user experience. This PSD contains a number of useful elements in a modern, sleek style.

Blaubarry UI Kit

Blaubarry UI Kit is a PSD full of useful buttons, sliders, scrollbars, and form elements. The file makes use of shape layers for easy editing and resizing.

Clean and Sexy Form Elements

Soft White UI Kit

Black UI Kit

Up for grabs is a free PSD UI kit designed by Alex Patrascu. The file is fully layered and very well organized to make it easy to work with. Alex did a fantastic job of including a lot of the common elements needed when designing a website or app.

Solid UI Kit

Solid UI Kit is a fresh design created by Alvin Thong from Sixbase. The download includes a well organized, easily editable PSD file.

Chrome Sliders and Toggles

Simple UI Elements

Simple UI Elements is a clean, well organized PSD file containing common user interface elements for web and app designs.

Mac OSX 10.8 Elements

UI-Element Set

Big Block UI

Big Block UI is a fresh take on common user interface elements. The PSD is well organized and colors can easily be changed.

Toggle switch

Blue Modern Web UI

Blue Modern Web UI is a clean, well organized PSD file with example buttons and form elements.

UI Resource

UI kit

 UI Elements