50 Free UI and Web Design Wireframing Kits, Resources and Source Files - Smashing Magazine 
Planning and communication are two key elements in the development of any successful website or application. And that is exactly what the wireframing process offers:
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Mockingbird | Wireframes on the fly
Mockingbird is a free-for-now app for creating wireframes.
Mocking Up with Mockingbird
Mockingbird is a free-for-now app for creating wireframes. This article discusses its strengths and weaknesses.
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Hot Gloo - The Online Wireframe App
Create web site wireframes and receive reviewers comments and feedback on the design.
FlairBuilder - User Interface Prototyping and Wireframes
Flairbuilder is a wireframing and prototyping tool that is web based.
Wireframe Websites That Wow
A directory of sites and commentary for wireframing web sites.
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iPlotz: Goofy Name Belies Powerful Wireframe Tool
iPlotz: Goofy Name Belies Powerful Wireframe Tool Written by Rick Turoczy / January 26, 2009 11:30 PM / 7 Comments « Prior Post Next Post » imgiplotz.jpgAnyone who has ever built a Web site for a client knows the painful process of gathering feedbac...
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Design Stencils
Yahoo! Design Stencil Kit is a series of templates and job aids to help build sites and pages.