I'm a big believer in not reinventing the wheel when it comes to web design. If someone has already created something that fits what you need and/or want, and especially if that element is available for free, then why waste your time designing something that turns out virtually identical? Your time and effort is better spent on creating new and unique parts of your design, while using what's already available for other parts. Below are more than 50 free UI element packs from a variety of designers. Buttons, form elements, media players, and similar stock elements are the most popular, though there are other elements included also. And as a bonus, there are over half a dozen premium element packs at the end. Enjoy!

Free Elements

Soft UI Kit: Free PSD for Mocking Up Web Designs

A set of common web elements for mockups, designed by Adrian Pelletier and provided by Six Revisions.

Transparent Glass UI: Free PSD for User Interface Design

This set of dark UI elements was created by PixelsDaily, and is also provided by Six Revisions.

Freebie: Modern UI Pack Photoshop PSD

A modern, minimalist UI kit with some simple, basic elements.

Freebie: Massive Web UI & Button Set

This web UI kit from MediaLoot includes brightly-colored buttons, info boxes, breadcrumbs, search forms, and many other elements.

Web UI Treasure Chest v1.0

This kit includes over 100 elements for your designs, including banners, buttons, tooltips, badges, and more.

Web Form Elements

A set of gray and gold web form elements, including text areas, buttons, and dropdowns.

Web Form Elements Vol.2

A set of gray web form elements, including sliders, dropdowns, tabs, and more.

Got Wood? UI Design Elements

A kit consisting of more than 100 modern UI elements with a wood-grain look.

Snow UI Kit

This UI kit from MediaLoot has a muted gray color scheme with dark bluish-gray accents.

Dark Mysterious Web Elements

This set of design elements was designed specifically for use with dark and highly-styled sites. It includes search bars, separators, buttons, audio player elements, and more.

Black UI Kit

The Black UI Kit includes glossy, black and blue elements, including plenty of media controls.

Moonify UI

Moonify is a set of UI elements that includes a search bar, rating stars, and some basic form elements.

Blue and White GUI Kit

A set of soft blue and white UI elements, including form inputs and buttons.

Black UI Elements

A set of glossy black and bright blue UI elements, including sliders, buttons, dropdowns, and text inputs.

"Grayness" UI Kit

Grayness is a set of form UI elements in light gray.

Solid UI Kit

The Solid UI Kit has a retro sci-fi look to it, with a yellow-gold color scheme.

Dark UI Element Set

A set of dark, slightly glossy buttons and UI elements with a purple loading bar.

E-Commerce Steps UI

The elements here are designed specifically as the second step of an e-commerce checkout process.

"Calligraphy" GUI Elements

A set of UI elements inspired by Chinese calligraphy techniques.

"Sepia" UI Elements

A set of brownish-gray form elements with an antique but clean feel to them.

Bloom UI Kit

The Bloom UI Kit includes buttons, form inputs, sliders, and more.

Apple Styled UI Elements

A set of Apple-inspired elements, including buttons and form inputs.

Textured Alerts

A set of transparent alert styles, with changeable colors and a removable texture overlay.

Header & Navigation Pack

A set of three navigation/header styles.

Simple UI Elements

A set of versatile minimalist, rounded UI elements.

Pretty Little Search Fields

These Pretty Little Search Fields come in two styles (rounded and square), with three different color schemes.

Add to Cart Buttons

A set of add-to-cart buttons in three muted colors.

Simple Tabbed Navigation

A PSD for simple tabbed navigation with dropdown menus.

Dark Button Navigation 2

A set of dark navigation buttons for horizontal or vertical menus.

Transparent Tooltips

A set of transparency tooltips in four colors, from Premium Pixels.

Neat Sliders - Free PSD

A set of retro sliders with chrome buttons and yellow accents.

Minimalist Horizontal Navigation

Simple navigation elements with subtle coloring and awesome state designs.

Sleek Dropdown Menu

A dark dropdown menu button.

Fancy Slider & Toggles

A gorgeous multi-colored slider with chrome ends.

A Minimalist Calendar Widget

A simple blue and gray calendar widget PSD.

Form Goodness Kit

The Form Goodness Kit is a set of minimalist but bold form elements, including input fields and buttons.

Green Contact Form

A simple, modern green contact form with icons and a submit button.

Modal Box Contact Form

A minimalist modal box contact form.

Login Form PSD

A highly-styled PSD login form.

Quick Sign In Form

A short, minimalist sign-in form in blue and gray.

Vintage Newsletter Form

A vintage-styled newsletter signup form.

A Clean Login Box

A minimalist login box in white and muted red.

All In One Web Elements Kit

A huge collection of elements in dark gray, red, blue, and green, this kit includes buttons, sliders, and multiple content styles.

Victor Elements

A set of retro-styled UI elements, including sliders and buttons.

Mini Gallery

A set of PSD image gallery elements.

Wraps and Ribbons Pack

A set of ribbon and wrap effect PSD files.

Design Elements

This pack includes search inputs, buttons, sliders, dropdowns, and more.

Big Block UI

The Big Block UI includes a number of bold elements, including a search box, sliders, rating stars, and a dropdown button.

Freebie: Modern Web UI Set

This set of black and gray, slightly glossy UI elements includes navigation, buttons, scrollbars, panels, and breadcrumbs.

Light UI Elements

A set of light gray elements, including buttons, media player controls, and breadcrumbs, with various colorful accents.

Spring GUI

A set of green elements, including buttons and dropdowns, among others.

Web Elements

A set of dark, multi-colored elements, that includes scrollbars, search fields, download buttons, and more.

Video Player

A slick video player chrome.

Premium Elements

Glorious Colors UI Kit ($6)

A set of brightly colored UI elements, including sliders, switchers, buttons, and more.

Glowing UI Kit ($5)

A set of glowing UI elements, including form elements, separators, buttons, and more.

Minimalist Slider Creator ($4)

Contains more than 70 elements for creating sliders, including shadows, frames, vignettes, and more.

Stitched Web Elements ($5)

Set includes a login box, subscription box, download button, and more, and comes in four different colors.

Subtle Web Elements II ($5)

A set of retro-styled elements with subtle color schemes that include bright blue and orange highlights.

Minimalist White Web Elements v3 ($3)

A set of white and light gray elements that are clean and fresh.

Web Elements Pack ($5)

A set of elements that includes banners, media elements, navigation, buttons, and badges, in five color schemes. What's your favorite site for finding PSD files for your designs? Let us know in the comments!