Wireframes

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Using @balsamiq today to create mockups for our #CRO clients. http://www.balsamiq.com/

Balsamiq Studios, makers of plugins for Web Office applications

Mockingbird | Wireframes on the fly

Brainstorm using Mockingbird, then use your mockups going into the building stage to make sure your team is on the same page — about every page. https://gomockingbird.com/
...if you use Cappuccino, those apps will automatically look and behave like ... desktop apps - with zero learning curve on the developer's side.

Cappuccino Web Framework - Build Desktop Class Applications in O

http://cappuccino.org/

••• HotGloo - The Online Wireframe App •••

Elements You’ll find a huge range of UI elements in the elements list. Standard elements: squares, cirlces, triangles, lines, rich text fields, image placeholders, labels, buttons, symbols, tables, dropdown menus, input fields, checkboxes, radio buttons, etc. http://www.hotgloo.com/

ScreenSketcher - create enlightened user interface mock-ups

http://www.codingrobots.com/screensketcher/ ScreenSketcher ScreenSketcher is a tool for creating quick mock-ups, or wireframes, of a computer user interface, such as a window, a web page, or anything that can appear on a computer screen.
http://www.serena.com/products/prototype-composer/index.html Serena Prototype Composer helps you quickly and accurately simulate how an application will look and function without writing any code.

Prototype Composer, Free Prototyping Tool - Serena Software