Pinegrow Web Designer lets you easily build and design webpages

Silex is a PHP microframework based on the Symfony Components.

Icecoder is a open-source code editor, providing a modern approach to building websites.

Google Web Designer is a program for Windows, Mac and Linux from Google for creating interactive HTML5 ads and other HTML5 content.

Adobe Edge Animate (Adobe Edge) is a web development tool that uses HTML5, Javascript, and CSS3 functionality.