Indigo Studio is a free prototype tool which lets you quickly create functional, animated UI prototypes while maintaining the focus on user experience at every step.

Whether you’re a designer without developer skills, a developer without design resources, or anyone with a great idea – you can design storyboards in real-world context, quickly prototype application design interactions that integrate with your storyboards, annotate those designs, and share your best designs with team members and key stakeholders.

FileReader.js is a lightweight wrapper for the JavaScript FileReader interface. This JavaScript interface allows you to read local files as binary.

FileReader.js does not require any other libraries. If you do use jQuery, there is a small plugin wrapping up the functionality though.

A color picker, or color chooser is a utility, usually found within graphics software or online, used to choose colors or create color schemes.

You can find a number of color picker tools on the internet but when it comes to customize / skin a color picker plugin, most of them uses a ton of images and hard to skin or customize, or are very large in size.

Spectrum is a simple color picker jQuery plugin which is lightweight and offers a familiar interface. It is easy to skin and customize the plugin with CSS, and there are a wide range of modes and options to explore.

Cool Kitten is a responsive web framework which makes creating parallax scrolling websites a breeze.

It is a collection of HTML/CSS and JavaScript files to be used for web designers and developers. With parallax scrolling, it makes a beautiful visual effect that brings a second life to every slide.

Lazy Line Painter is a free jQuery plugin for path animation using the Raphaël Library.

Implementing this plugin is broken into two parts: Preparing your web-friendly data & Configuring lazy-line-painter.js

To make this SVG path animation library work, you need to follow certain steps to prepare your SVG data. It offers number of useful attributes for configuring lazy-line-painter.

Squash is an open source exception reporting and bug analysis tool. It is a collection of client libraries that records exceptions in your code, and gives you the tools you need to analyze and fix the bugs that caused those exceptions. The main emphasis is finding someone who can take responsibility for the bug and notifying that user, keeping the signal-to-noise ratio very high.

For more difficult bugs, Squash has a suite of collaboration tools, like commenting, assigning, and resolving bugs. There are lots of other features: Squash can symbolicate iOS stack traces, de-obfuscate Java traces, and source-map JavaScript call stacks.

glDatePicker is an ultra-simple, easily customizable, light-weight (just over 7KB compressed or 25KB ncompressed) date picker jQuery plugin.

• Stylize current date, selected date, special dates and individual days of the week
• Set data on special dates (that is returned on callback when selected)
• Automatically jump to respective month on selection
• Offset days of the week (e.g. make Wednesday the first day of the week)
• Individual styles per date picker on the same page

Junior is a front-end framework for building HTML5 mobile apps with a native look and feel.

• CSS3 Transitions optimized for mobile performance.
• Swipable carousels using flickable.js.
• Integration with backbone.js views and routers.
• Ratchet CSS UI components.
• Try loading this page on a mobile phone or try our “simulator” to the right.

Framer is a modern prototyping tool. It can help you to quickly build and test complex interactions and rich animations for both desktop and mobile.

It Uses webkit CSS transforms to render on the GPU for smooth performance and works great in desktop and mobile Safari or Chrome. Offline too. Framer can be seen as an alternative to Flash or Quartz Composer. It’s targeted at designers that can do basic javascript, up until experienced interface programmers.

Docverter is a document conversion server with an HTTP interface. Docverter converts plain text documents written in HTML, Markdown, or LaTeX to PDF, Docx, RTF or ePub with a simple HTTP API.

Docverter lets you get going immediately without having to set up your own document conversion tools. Docverter wraps several open source projects to make your documents come out perfect every time.