- Read this UX tutorial first – Alan Wells
- Great list of rapid prototyping tools here – dan harrelson
- POP – Prototyping on paper for the iPhone
- Keynotopia – use PowerPoint/Keynote to create web/mobile apps – Cool!
- JustinMind– define web and mobile apps with interactive prototypes
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- JustinMind UserNote – get user feedback/test usability
- Lean Design – design using HTML5-editor and automatically convert it to XHTML/CSS
- Balsamiq– rapid wireframing tool. software mockups in minutes
- Napkee – export Balsamiq Mockups to HTML/CSS/JS and Adobe Flex 3 at a click of a button
- FluidU/I – mobile prototypes for IOS
- Draw.io – draw diagrams online
- Moqups – HTML5 App used to create wireframes, mockups or UI concepts
- MxGraph – client side JavaScript diagramming library
- Pencil– Firefox add-on to do GUI prototyping and simple sketching
- Lumzy – quick mockup creation and prototyping
- CSS Hat – Turn Photoshop layers into CSS3
- Mockflow – online/offline, extensible wireframing tool w/design library
- OmniGraffle – it’s been around before the web even existed
- Wirify – turn any webpage into a wireframe
- LucidChart – Cloud-based drawing tool
- InVision – UX Prototyping from jpg, .png or .gif files
- Cacoo – free online drawing tool
- Axure – Wireframing, prototypes: buil-in widgets and shapes
- HotGloo – Online Wireframing Tool
- Mocksup – Share your web site mockups
- Mockingbird – Mock it up and share web site wireframes
- Protoshare – website wireframing
- Gliffy – Online Diagraming
- Keynotopia – wireframing + high fidelity (pixel perfect) prototyping tool
- Free Wireframe templates for iPhone, iPad and Web
- Wireframing Tutorial