Lucidchart
Online diagram and flowchart software that supports Microsoft Visio import and can work on any operating system.
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...
protoshare is a webbased, collaborative wireframing and prototyping tool. it hosts a wysiwyg draganddrop interface, as well as advanced components users can customize.
protoshare is not a flash tool; it uses html, css, and javascript. web developers around the world, fortune 500 companies, and leading interactive agencies use protoshare's collaborative prototyping to deliver better website and mobile experiences in less time. no software required.
what's new in version 6.3: a community library of customizable stencils & widgets and an expansion component styling options.
wireframe websites. prototype applications. prototype mobile apps. iterate on your ideas, get feedback, then mark and track decisions made.
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Online diagram and flowchart software that supports Microsoft Visio import and can work on any operating system.
Freemium
Pencil is a standalone app or Firefox extension that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
Free Open Source Mac OS X Windows Linux Firefox Electron / Atom Shell
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.
Commercial Mac OS X Windows Web
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. Best tool for quick prototyping.
Freemium Web
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.
Commercial Web
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.
Commercial Self-Hosted Wordpress
SwordSoft Layout is an desktop application that makes it very easy for you to create, preview, and manage mockups of your website, mobile application or desktop...
Commercial Mac OS X Windows