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Using Balsamiq Mockups feels like you are drawing, but its digital, so you can tweak and rearrange controls easily, and the end result is much cleaner. Teams can come up with a design and iterate over it in real-time in the course of a meeting.

InVision's prototype tool lets you create interactive wireframes and high-fidelity prototypes. Share your work and get instant feedback right on-screen.

Free web and mobile mockup tool.Transform your design and mockups into clickable interactive applications. Perfect way to validate ideas faster with lean startup thinking.

UXPin is a web-based system for managing design documents like wireframes, sitemaps, persona descriptions or flowcharts. It lets you upload image files, invite teammates to review and comment on them, and keep track of revisions. The system also includes its own wireframe editor that supports real-time collaboration and allows you to export your wireframes to HTML. Another feature worth noting is that UXPin can convert paper prototypes into digital wireframes as long as they have been created using an official UXPin notepad (available for $30 on their website). You simply take a picture of the prototype and it will automatically be recognized by the UXPin app. Prices for UXPin start at $7 per month for a single-user project. »

Fluid UI is the fastest mobile app prototyping tool available. Design and test your low and high fidelity app mockups on a mobile device with ease. Simple and UX oriented, this UI tool helps unlock creativity and will save your team time and money while gathering app requirements.

Designed specifically for mobile, Proto.io can simulate everything an app can do. That includes interactive touch gestures, screen transitions and animating any UI item in a prototype. It is perhaps the only mobile prototyping tool that allows users to create realistic, sharable prototypes that work as a real app should and experience their prototype on the actual device. Proto.io is also the first prototyping tool to ever include custom device support, to allow prototyping for anything with a screen interface - from SmartTVs to refrigerators. »

"The most stunning HTML5 App for creating high fidelity, resolution independent SVG mockups and wireframes!"

A functional wireframe is the best way to reduce costs of your software projects. Simulate your wireframes and mitigate risks.

ViewFlux allows you to capture feedback, create clickable prototypes from your designs & collaborate seamlessly with your clients.Share fully interactive prototypes, chat & collaborate with team mates and share the output with clients.

Build your idea into a product.Design and programming skills are no longer necessary to create a product. With STUDIO, you can make your idea into a real product regardless of your skill and knowledge.

mockingbird is an online tool that makes it easy for you to create, link together, preview, and share mockups of your website or application.It is not Flash based.

Pixelapse is visual version control and collaboration platform for designers. It powers the document backup, version control and collaboration needs of thousands of creative teams, agencies and freelance designers.

SavahApp is a collaborative platform that streamlines feedback right to your design screen that allows designers to create high-fidelity prototypes for web and mobile apps without writing a single line of code. With Savah, designers, design agencies and businesses can transform their designs into attractive interactive prototypes and mock-ups for web and mobile apps. Users can share these prototypes with a single click to their team / clients to get their visual feedback right on the design screen. No more emailing back and forth your design files you can effortlessly invite your design team/clients to your projects where they can review and contribute. »