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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.

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. »

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

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.

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. »

Specfox is the first tool to address the tedious process of writing website specifications, which is often frustrating and time-consuming. You shouldn't be spending hours trying to explain developers design features and creating ugly descriptions in software which was not built for that purpose. Specfox helps you create, edit & manage design specifications easily and pain-free.

Use your existing WordPress site to get feedback on your design projects. Upload your design images, wireframes, mockups, logo sketches, photography and more. Gather comments directly on top of your designs. Get clear approval and move forward with the project.

Xiffe is an ideal platform for creating interactive prototypes for your mobile apps in a jiffy. It lets you drag-drop native controls for iOS, Android and Windows Phone (and tablet) apps and create interactive prototypes. You can add screen transitions between views to simulate actual flow between screens. The prototypes can be share with others and seen on mobile browsers to see how it would behave on an actual device.

ProtoShare is a web-based, collaborative wireframing and prototyping tool. It hosts a WYSIWYG drag-and-drop interface, as well as advanced components users can customize.

Upload your designs,mockups or wireframes by file or by URL snapshot, organize them and connect them to web prototypes. Share them with friends, colleagues and clients to get point specific Feedback. Giving Design Feedback is also possible without any registration.

Markly is a measure and design spec plugin/extension for Photoshop & Sketch. It is made for modern web designers & app front-end developers. You can add specification marks by simple clicking and dragging. Coordinate, dimensions, distance or fonts, no matter what and where you want. http://marklyapp.com