Lucidchart
Online diagram and flowchart software that supports Microsoft Visio import and can work on any operating system.
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.
uxpin is a webbased 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 realtime 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 singleuser project.
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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