Google Web Designer overview
Google Web Designer is an advanced web application that lets you design and build HTML5 advertisements and other web content using an integrated visual and code interface. Using Google Web Designer's Design view you can create content using drawing tools, text, and 3D objects, and you can animate objects and events on a timeline.
Google Web Designer also provides a library of components that lets you add image galleries, videos, maps, and other kinds of functions to your web sites and advertisements.
Google Web Designer is free to download, and free to use.