To mock-up the user interface of a website, software or any other product, you’ll need some basic UI elements. And this is where wireframing kits and UI design kits come in handy. When you want to create a low-fidelity prototype for your projects, you can use these kits to give your idea a certain shape, keeping it abstract and not losing yourself in details.
In this post, we’ve prepared an overview of useful web and mobile user interface kits, handy PDFs and resources that you can use in your projects. We’ve carefully selected the most useful kits and resources to get you going in the early stages of a project.

[Offtopic: by the way, did you know that there is a Smashing eBook Series? Book #1 is Professional Web Design, 242 pages for just $9,90.]

Free Mobile GUI PSD

Android GUI PSD
This Android GUI PSD is based on elements of the Android 1.5 GUI and was made to help the open-source community with its Android application mock-ups. Most of the elements and phone illustrations are done in vector paths and so are easily resizable. Android Sans was used for the text.

Uidesignkit50 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

RIM Blackberry PSD
A complete PSD file with layer styles, this has 135 layers of Photoshop goodness.

Uidesignkit48 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Android Sketch Stencil Version 1.0
A Sketch-style Android OmniGraffle template. The purpose of the sketch style wireframe is to prevent the audience from thinking about visual design and encourage them to focus instead on functionality and behavior.

Wireframes-130 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

All elements of Maemo 5 GUI in PSD
This downloadable PSD file contains GUI template elements for the Maemo platform. These are indispensable for prototyping GUI applications running on Maemo devices.

Uidesignkit58 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPhone 4 GUI PSD (Retina Display)
GUI PSD kit for creatives who design for the retina display (640×960). The file is huge, both in file size (62.7MB) and dimension (4074×2986). You’ll need to work at 25% – 50% even on the largest screens to roughly grab elements before zooming into 100% for the actual work.

Uidesignkit29 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPad GUI Kit in PSD
This version offers a canvas size true to the iPad at 768×1024. In addition, most of the graphical elements are provided in vector format, allowing you a lot of room to scale up for high-resolution presentations. This version is layered in Photoshop, making it easy for you to go nuts with your mock-ups and client presentations.

Uidesignkit56 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Android 1.6 Wireframe stencil for Omnigraffle
Download this beautiful wireframe stencil add-on for OmniGraffle 5.x. Use this toolkit to wireframe Android-based apps and websites on the 1.6 Donut SDK.

Wireframes-132 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Google Android GUI PSD
Here are the GUI elements of Android, built using vectors to scale.

Uidesignkit51 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPad GUI PSD Kit
This pack includes full size graphics, as well as 256, 128 and 64 pixel icon sizes. The pack includes four sizes of the iPad graphic in PSD, PNG and Mac ICNS formats.

Uidesignkit55 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Google Android PSD
A stencil set for Google Android prototyping.

Uidesignkit54 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Fireworks template for Android
In this Fireworks template, Android UI elements have been redrawn as vector images. In the folders, the elements have been mostly labeled according to the Android vocabulary.

Uidesignkit52 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Sexy Vector Cell Phone
This phone can be scaled to any size. Easily add your own image to the screen with the included object mask. All objects are layered, grouped and labeled for easy customization.

Uidesignkit42 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPad Stencil for Omnigraffle
Contains backgrounds, title bars, buttons, selectors and other iPhone UI elements. The text is fully editable in lists, title bars, buttons and scroll wheels.

Uidesignkit28 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPhone App Wireframe Template

Uidesignkit45 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Mobile – iPhone

Uidesignkit44 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPhone GUI Elements
Some beautiful iPhone elements. All graphics are layered Photoshop files.

Uidesignkit5 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPad and iPhone Design
Design your application for the iPhone, iPod Touch and iPad with this exhaustive set of stencils. All stencils were created by hand with native OmniGraffle shapes, and groups and can be scaled, resized and exported to other vector formats in Graffle.

Uidesignkit46 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Design Stencil for iPhone and iPad
A stencil for designing OS applications for the iPhone, iPod Touch and iPad. The stencil for now is targeted at developers familiar with the default characteristics of the views and controls provided by UIKit.

Wireframes-101 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Apple iPad fully editable PSD
A fully editable Apple iPad in PSD format. Every element you see is editable via vector masks, and everything is scaleable.

Wireframes-102 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Palm Pre GUI PSD
This set contains a PSD to help designers pitch and develop polished concepts using Photoshop.

Uidesignkit57 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPhone UI Vector Elements
Most visuals for applications start out as vector mock-ups in Adobe Illustrator. So, here are some cool iPhone UI vector elements. And there are even a few good Photoshop resources and even a nice OmniGraffle iPhone UI file or two in there.

Wireframes-103 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPad Vector GUI Elements: tabs buttons menus icons
This set contains almost all of the iPad UI elements, including buttons, tabs, menus, keyboard and balloons. Useful for designers and developers, it includes scalable and totally editable vector versions (AI).

Wireframes-104 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Free Social Networking GUI PSD Kits

Free Full-Layered Facebook GUI PSD Kit
The idea behind this kit is to speed up the prototyping of Facebook application UIs and Facebook fan pages, sparing you from drawing all the comps and letting you customize all the text, buttons and data as you need. The kit is free to use in all projects, without any restrictions.

Uidesignkit12 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Facebook GUI Free PSD Resource
A Facebook graphic user interface (FBGUI) resource kit for Photoshop to make your work easier.

Uidesignkit22 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Facebook Applications
A sizable collection of elements for creating wireframes for Facebook applications.

Uidesignkit23 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Omnigraffle Twitter Widget Stencil
This set includes a selection of useful Twitter widgets and badges.

Uidesignkit21 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Wireframing Kits

Best Practice UX Forms Stencil v1.1
A comprehensive release of stencil that follows best practices for UX form design, providing three different ways to lay out forms, each with its own benefits. This version also provides different button layouts, a progress indicator, a Captcha code input field, labels and more.

Wireframing-106 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Form Elements UI Kit
Form elements stencil from the Design Stencil kit in the Yahoo! Design Pattern Library.

Form in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Wireframe Shapes
Here is a set of shapes for making wireframes in OmniGraffle version 5.x ( forMac OS X). It consists of most of the basic elements you’ll need to create user interface specifications.

Wireframing-104 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Wireframe kit for UI Designers
A set of various wireframes, such as product details, list of items, front page, mobile phone.

Wireframes-113 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

MBTI sketching paper for ideation
MBTI sketching paper for ideation sessions. It helps you think inside the box of four personality traits. Describe a design challenge and the problem to solve on every piece of paper. There’s also space for annotations.

Wireframes-105 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

A4 sketching paper
This sketching paper can be used after generating ideas for functionality. Design preliminary screens based on the ideas you come up with.

Wireframes-106 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Wireframe Magnets (DIY Kit)
This DIY magnet template is based on the Konigi wireframe stencils, and it includes three sheets of elements that might be useful for whiteboard prototyping. Simply download and print the PDFs onto magnet sheets, optionally laminate them if you intend to use with dry-erase markers, and then cut them out.

Wireframes-107 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Paper wireframe templates
The finished product include seven variations, as well as PSDs.

Wireframes-108 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Wireframe template
A useful print-and-sketch template available for downloading.

Wireframes-109 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

iPad Idea Sheet
A total of three sheets: one full size (landscape), one at 70% reduction (vertical) and one at 50% reduction (landscape). The 80 tiny dots make it easy to split the screen horizontally and vertically.

Wireframes-110 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Scenario, Taskflow and Grid Sketch Sheets
A set of beautiful printable sheets for ideas and sketching

Wireframes-111 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Free Photoshop browser template
Need a clean browser screenshot for a design presentation? Look no further. These free professional Photoshop browser templates come in 1024×768 and 800×600 pixel sizes and all kinds of flavors.

Wireframes-112 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Interactive Sketching Notation 0.1
The idea behind this notation is to visualize user interface states as well as user actions in a clear and rapid manner.

Notations2 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

MobileMe Full iPhone GUI
For use with WinterBoard, this is a beta release, so there may be unthemed elements.

Wireframes-116 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Android Wireframe Templates (PDF)

Wireframes-118 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Free Keynote UX Stencils

Wireframes-126 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Advertising Stencil Kit
A set of very useful advertising stencils.

Wireframes-131 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Dragnet website wireframes kit v 0.9
Dragnet website wireframes kit v0.9 is a common library for Adobe Fireworks and contains over 25 objects that are useful for rapid prototyping of websites. It is completely free to download and use. The kit contains common Web design elements, such as scrollbars, buttons, menus and alerts.

Wireframes-133 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

User Interface Design Framework
This pretty and comprehensive design framework contains a GUI library of hundreds of vector elements for interface design. This minimal UI icon set has 260 vector icons and a library of 200 styles for Illustrator.

Uidesignkit1 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Browser Form Elements PSD
Included here is a set for Firefox 3 for Mac and another for IE7 on Vista.

Uidesignkit14 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Sketching and Wireframing Kit
Here is a free set of elements for sketching and wireframing. It consists of form elements, icons, indicators, feedback messages, tooltips, navigation elements, image placeholders, embedded videos, sliders and common ad banners.

Uidesignkit3 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Photoshop Form Element Templates
This set includes all common form fields and mouse and link pointers, optimized for ease of use.

Uidesignkit37 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Web Browser Elements
This excellent and useful kit contains pull-down menus, input fields, radio buttons, check boxes, buttons, text fields and scroll bars, all in an easily editable PSD file.

Uidesignkit4 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

UI Design Kit
This Web UI template kit is made completely with shape objects, which in some cases convert to SmartObjects, so they’re totally scalable.

Uidesignkit7 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Wireframe Symbols
This download contains a symbols library and a full Adobe Illustrator file, with all of the elements spread out on the art board. To install this library, just drag and drop the Wireframe Symbols.ai file into your Illustrator Symbols directory. Once you are in Illustrator, go to your Symbols palette, and load the library.

Uidesignkit9 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Web UI Element Pack
This pack, in PSD format, contains 19 elements including loading bar, default and clicked-state buttons, button toggle, icons for “Close,” “Next” and “Previous,” paging icon and slider.

Uidesignkit13 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Wireframe Kit for Google Drawings

Uidesignkit15 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

OmniGraffle Stencil for Ext JS v3.0
This updated version of Ext JS Omnigraffle stencil contains many improvements and additions, namely the recreation of most Ext JS elements as Graffletopia shapes or groups, especially helpful for resizing titles, tables cells and so on.

Extjs in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Flex 3 Stencil
Includes all Flex components from the Flex 3 Style Guide: panels, data grid, buttons, fields, links, toggle, menu, scrolls, accordion, tabs, list, data picker, tooltips and errors.

Uidesignkit19 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Aqua GUI
A series of elements inspired by the GUI Design Palette 1.2 and the Mac OS X interface stencils, based on Aqua, and mainly intended to make simple window designs.

Uidesignkit20 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Flex Darkskin PSD UI
A beautiful set of 16 PSD files.

Uidesignkit24 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Web Wireframe Kit
Here is a simple way to plan a layout and a cost-effective, time-saving wireframe kit for Web designers.

Uidesignkit27 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

UI Buttons and Icons
This set contains 165 high-quality UI icons and buttons in five different colors. Available in AI, JPEG and SVG formats.

Uidesignkit8 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Quommunication Stencil Kit
This beautiful set contains design elements for wireframing, RSS feeds, colors, advertising units, browser windows and grids.

Uidesignkit30 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Mac OS X Interface 2
A Leopard-y interface stencil kit that makes extensive use of tables for maximum flexibility while maintaining pixel precision.

Uidesignkit31 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

OmniGraffle UX Template
The OmniGraffle Pro (v. 5) template for interface design. Includes shared layers for basic UX document needs (e.g. title page, wireframes, storyboards).

Uidesignkit32 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Template for Blueprint CSS Comps
This template allows you to create visual design comps to be implemented using a CSS layout framework. The Adobe Illustrator document features a 24-column grid for CSS frameworks such as Blueprint.

Uidesignkit33 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Apple Elements for OmniGraffle
Stencils of Apple hardware and miscellaneous networking components. Excellent for creating physical diagrams.

Uidesignkit36 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

DeviantART ID PSD Kit
These 15 professionally designed, fully customizable templates include MINI and Original ID templates.

Uidesignkit40 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Browser Screens and Website Elements
Here is a useful set of vector assets you can use to mock up client projects, present your work or get a quick visual while laying out a website.

Uidesignkit41 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

960 Grid Template for OmniGraffle

Uidesignkit43 in Free Wireframing Kits, UI Design Kits, PDFs and Resources

Control of different browsers for designers (download link)
A PSD library of controls in browser interfaces of Mozilla Firefox, Opera, Internet Explorer and Safari.

Controls in Free Wireframing Kits, UI Design Kits, PDFs and Resources
Free Wireframing Kits, UI Design Kits, PDFs and Resources for mobile phone