A set of Free, helpful, quality User Interface Design elements, icons and styls to design faster wireframes and create better mockup deliverables in Illustrator.

The set contains:

• GUI library – Hundreds vector elements for interface design
• Minimal UI icons set – 260 vector icons for Illustrator
• Styles library – 200 styles to apply in Illustrator

These user interface design elements can be customized easily to your own needs : you can easily resize, color or tweak their appearance.

Cool Icons Library for Prototyping

Splashy Icons – A cool icons library for prototyping containing 400+ free PNG icons.

This icons library can be used in web applications, websites, desktop software and for application prototyping.  The package comes in 16*16 px.

Gesturecons, free vector icons created for multi-touch screen interfaces to aid in the design, development and implementation. Gesturecons can help in the creation of wireframe documents, digital help files and printed documentation.

FlockDraw is a seamless real-time online collaborative drawing tool. This online drawing tool simply saves your lot of time. You don’t need to go for the professional software like Photoshop for basic wireframes and minor drawings to show your clients or friends.

Free Yahoo Design Stencil Kit

Yahoo Design Stencil Kit version 1.0 is available for OmniGraffle, Visio (XML), Adobe Illustrator (PDF and SVG), and Adobe Photoshop (PNG).

Download Yahoo Design Kit

iPhone PSD Vector Kit

iPhone Starter Kit, a set that comes with several button elements as well as six different iPhone interface options. This pack may be useful for mobile developers and front-end designers who need a professional way to show mock-ups to clients or to work out ideas.

Download iPhone PSD Vector Kit

Diagrams are great, because they are a very simple and extremely efficient way to intelligibly represent even the most complex ideas. But drawing diagrams can also be very complicated, simply because most diagramming softwares require you to draw.

Lovely Charts is an online diagramming application, that allows you to create professional looking diagrams of all kinds, such as flowcharts, sitemaps, organisation charts, wireframes, and many more… for FREE.

Lovely Charts is extremely simple and intuitive drag’n drop drawing mechanism, you’ll be able to focus on what really matters. You won’t have to draw boxes and arrows, you won’t have to worry about what symbol to use.

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The 960 Grid System is an effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels. There are two variants: 12 and 16 columns, which can be used separately or in tandem.

The premise of the system is ideally suited to rapid prototyping, but it would work equally well when integrated into a production environment. There are printable sketch sheets, design layouts, and a CSS file that have identical measurements.

Use Jumpchart to quickly plan out the navigation of your site by adding pages, and sub-pages. If you change your mind, easily drag pages to new spots within the site hierarchy.

You can use simple Textile formatting to add text, files, special formatting, and even forms to the pages of your wireframe.

Wireframes are great, but Jumpcharts are better. A Jumpchart is shareable, exportable as clean CSS, and automatically generates its own sitemap.