Web Site Development and Testing
Enter a URL to get a Web page snapshot (or upload an image), add annotations, and share with colleagues via Facebook or Twitter to solicit feedback.
Test browser compatibility across OSes by requesting bulk screenshots for an URL running on up to 180 browsers.
A sandbox with configuring interface for testing HTML+CSS code snippets — with save-to-Github Gist (above).
For when you absolutely need to check how Internet Explorer renders a page in versions 5.5 and 6 through 11.
A front-end Web page development sandbox with real-time collaboration including screen sharing, text and audio chat, and more.
8)Web Design Tools:
Not a tool per se, but a big list of over 80 Web design tools for browser, desktop and mobile use.