Nibbler is a free tool for testing websites. Enter the address of any website and Nibbler will give you a report scoring the website out of 10 for key areas, including accessibility, SEO, social media and technology. Nibbler is fast and completely free.
Nibbler uses “Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3” for all requests. Because Nibbler is a bot, and not a real web browser, it shouldn’t affect most analytics results. Modern analytics solutions generally use Javascript to detect visitors.

Requirements: –
Demo: http://nibbler.silktide.com/
License: License Free
Lychee is a free photo-management tool, which runs on your server or web-space. Installing is a matter of seconds. Upload, manage and share photos like from a native application. Lychee comes with everything you need and all your photos are stored securely.
You can upload, move, rename, describe, delete or search your photos in seconds. All in one place, right from your browser. Look at all your images in full-screen mode, navigate forward and backward by using your keyboard or let others enjoy your photos by making them public.

Requirements: PHP and MySQL Framework
Demo: http://lychee.electerious.com/
License: MIT License
Walkway.js is an easy way to animate SVG images consisting of line and path elements. Simply create a new Walkway instance with a supplied options object. When you want to start animating call .draw on the returned instance providing an optional callback that will be called when drawing is complete. Currently, Walkway.js only works on path and line elements.

Requirements: JavaScript Framework
Demo: http://www.connoratherton.com/walkway
License: License Free