Indigo Studio »

An interaction design tool that helps you “create functional, animated UI prototypes while maintaining the focus on user experience at every step”

PlaceIt »

This is awesome. Drag and drop an image into the browser to “generate product screenshots in realistic environments”.

Remote Preview »

A tool that “allows you to preview any URL on large number of mobile devices simultaneously. Just enter a URL, hit enter, and new URL gets automatically loaded on each device. Remote preview works on platforms like Android, Blackberry, iOS, Maemo, Meego, Symbian, Windows Phone and WebOS.”

Timeline JS »

Beautifully crafted timelines that are easy, and intuitive to use. TimelineJS can pull in media from different sources. It has built in support for: Twitter, Flickr, Google Maps, YouTube, Vimeo, Dailymotion, Wikipedia, SoundCloud and more media types in the future.

Creating one is as easy as filling in a Google spreadsheet or as detailed as JSON.