Lucidchart
Online diagram and flowchart software that supports Microsoft Visio import and can work on any operating system.
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.
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.
mockups wireframes wireframe-prototype design
Online diagram and flowchart software that supports Microsoft Visio import and can work on any operating system.
Freemium
yEd is a powerful diagram editor that can be used to quickly create diagrams manually or import external data for analysis and auto-magically arrange even large data sets by just pressing a button.
Free Mac OS X Windows Linux BSD Web
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams.
Free Open Source Mac OS X Windows Linux BSD
OmniGraffle can help you make eye-popping graphic documents—quickly—by providing powerful styling tools, keeping lines connected to shapes even when they’re moved, and magically organizing diagrams with just one click.
Commercial Mac OS X iPad
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
ConceptDraw PRO v11 is the only product that supports Visio legacy, runs on macOS and Windows, and is a perpetual license. Import/Export VDX, VSDX, VSSX and Import VSD, VSS files.
Commercial
Google Drawings allows users to collaborate creating, sharing and editing images or drawings.
Free Chrome OS Web Chrome
Simple vector graphics editor for creating flowcharts, UML class diagrams, illustrations and slide shows.
Free Windows