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GUI Design Studio is a graphical user interface design tool to rapidly create software prototypes with no coding. Draw screens, web pages and components, connect them together to storyboard workflow then run as a prototype to test your designs.

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Opensource, Free and Useful Online Resources for Designers and Developers

EaSynth ForeUI is an easy-to-use UI prototyping tool. You can use ForeUI to create skinnable prototype of software or website, and run the interactive simulation in your web browser.

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Balsamiq Studios is a fast-growing, but still-very-personable software company that aims to make the world a better place by helping people create software that is easier to use. We like to compete on usability and customer service.

MockFlow is an online wireframe tool for software and websites

InVision lets you transform your designs into beautiful, interactive web & mobile mockups and protoypes!

Fluid UI is the fastest browser-based mobile app prototyping tool available. Design and test your low and high fidelity mobile app mockups on a mobile device with ease. Simple and UX oriented, this UI tool helps unlock creativity and will save your t...