Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.
Responsive Web Design Testing Tool
This tool has been built to help with testing your responsive websites while you design and build them. You can enter your website's URL into the address bar at the top of this page (not your browser's address bar) to test a specific page.
GuideGuide an extension for Adobe Photoshop that makes it easy to place guides and create grids in your document or selection.
Search Engine Spider Simulator
This tool Simulates a Search Engine by displaying the contents of a webpage exactly how a Search Engine would see it. It also displays the hyperlinks that will be followed (crawled) by a Search Engine when it visits the particular webpage.
LiveReload monitors changes in the file system. As soon as you save a file, it is preprocessed as needed, and the browser is refreshed. Even cooler, when you change a CSS file or an image, the browser is updated instantly without reloading the page.
Acquia Dev Desktop
The fastest way to Drupal! Includes Acquia Drupal and everything needed to run it ("AMP stack") on Mac or Windows. Develop locally, then push changes to Acquia Cloud or any other host.
The #1 marketplace for premium website templates, including themes for WordPress, Magento, Drupal, Joomla, and more. Create a website, fast.
CSS Sprite Generator
A tool for generating image sprites and CSS for your web site. Using this tool can help you dramatically reduce the number of HTTP requests made for higher performance.
Initializr is an HTML5 templates generator to help you getting started with a new project based on HTML5 Boilerplate. It generates for you a clean customizable template with just what you need to start!
The Typetester is an online application for comparison of the fonts for the screen. Its primary role is to make web designer’s life easier.
Westciv - Tools & Resources for Web Professionals
CSS Editor with WYSIWYG editing, Wizards and hand coding tools for Windows and Mac OS X.
Ai to Canvas Plug-In
The Ai->Canvas plug-in enables Adobe® Illustrator® to export vector and bitmap artwork directly to an HTML5 canvas element that can be rendered in a canvas-enabled browser. The plug-in provides drawing, animation and coding options such as events so that you can build interactive, well-designed canvas-based web apps.
HTML5 IE enabling script - Source code adds new HTML5 elements (which is simple code), but also supports printing HTML5 elements and includes the default styles for HTML5 elements, like block on article and section.