Iplotz

PowerMockup is a PowerPoint add-in for sketching screens of web and desktop applications. The interface elements make it a breeze to prototype and evaluate different design ideas before proceeding to …

WireframeSketcher is a software tool that helps quickly create wireframes, mockups and prototypes for desktop, web and mobile applications. It comes both as a plug-in for any Eclipse-based IDE and …

Serena Prototype Composer - the best agile application prototyping tool is now free! View the demo, take the product tour, or download it free today.

Turn your Dropbox images into prototypes for any device and get feedback. No coding required.

Sketch Lab is a web based user interface (UI) sketch / prototype tool. It supports desktop and mobile platforms.

Tiggr is an application for creating user interface prototypes collaboratively online.

MockupCreator is a tool to create mockups, prototypes and wireframes. MockupCreator will help you to accelerate your products development and improve the quality of the product design.

Mockup Designer, built with Backbone, Backbone-LocalStorage and Html2Canvas, is a super-easy-to-use mockup tool that uses the local storage of your browser as its backend. However the data layer is loosely...

Mocklinkr is a web application that allows designers to: upload and host their mockups; link them together and make them interactive; and provide a mechanism for their clients to leave …

UIreframe is an online web-based tool that lets you create nice wireframes and mockups easily for your websites or software applications. With UIreframe you can collaborate and share your creations, …

Prototype cheaply and quickly for iPad, iPhone, Android, Windows Phone 7, Facebook and web using Apple Keynote, Microsoft PowerPoint or OpenOffice Impress.