Sketching, Wireframing online

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Get flash to fully experience Pearltrees
http://prevue.it/ Either send your clients an individual image, or group your work together into projects. If you're looking for feedback, your client can even add comments and annotations.

Prevue - Concept Sharing for Designers

http://www.lovelycharts.com/

Lovely Charts | Free online diagram software - Flowchart & proce

Lovely Charts is a diagramming application that allows you to create professional looking diagrams of all kinds, such as flowcharts, sitemaps, business processes, organisation charts, wireframes and many more.... Now available in 2 flavors!

Home - Pencil Project

Pencil will always be free as it is released under the GPL version 2 and is available for virtually all platforms that Firefox 4+ can run. The first version of Pencil is tested against GNU/Linux 2.6 (Fedora, Ubuntu and Arch) with GTK+, Windows XP and Windows Vista/7. http://pencil.evolus.vn/en-US/Home.aspx

Prototype Composer, Free Prototyping Tool - Serena Software

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. Instead of endless text entries, complex data hierarchies, or technical UML diagrams, Serena Prototype Composer makes it easy to collaborate on requirements by building simple, high fidelity prototypes that look like the real thing.

Axure - Wireframes, Prototypes, Specifications

Instantly generate customizable, functional specifications in Microsoft Word format that document the interactions, annotations, and even content in your design. Whether it's the functional specifications, the interactive prototypes, the beautiful wireframes, or the sketchy user interface mockups, we want your team and clients to love them and to love you for them. http://www.axure.com/
http://www.balsamiq.com/products/mockups

Mockups Home | Balsamiq

Why Balsamiq Mockups for wireframing? Using Mockups feels like drawing, but because it’s digital, you can tweak and rearrange easily. Teams can come up with a design and iterate over it in real-time in the course of a meeting.
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/

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

GUI Design and Software Prototyping Tools - Caretta Software

http://www.carettasoftware.com/ The Software Prototyping and User Interface Design Tool for Desktop, Mobile and Web Applications. Quick and Easy to use, with No Coding. You'll Wonder How You Managed Without It!
https://pidoco.com/en/homepage

wireframe creation, interface design and gui prototyping tool

Boost product quality! With our remote usability testing feature you can perform moderated online usability tests with real end users quickly and easily, without the usual cost of lab-based user testing, using screen-sharing, VoIP, chat and session recording functions.