Download, install and launch the Bootui layout builder application.
Click on the bootstrap component you want (on the left hand side) , for example a navbar or a row, Drag and Drop the the selected component from the left hand side panel on the right hand side canvas. You can select a variety of components on the left hand side panel in the user interface and drop them on the right hand side canvas in the UI.
Double click on the bootstrap component that has been dropped in the right hand side canvas of the software. You will see that a property editor pops up. You modify the brandname that shows up in the navbar. As you edit it you will see that the preview on the bottom is getting updated real time as you type!! Keep repeating steps 2 and step 3 to create multiple components.
Click on the publish button at the bottom of the UI of the bootrap builder. You have just created a responsive layout without writing a single line of code. You will get a neatly organised folder structure containing files and all dependencies. This published structure can be deployed easily. You can use these published files as responsive templates and enhance and build on top of it.
There are many frameworks available for free in the market that allow building of responsive layouts for web pages. Some popular names are Bootstrap, Pure, Foundation, Montage, Skeleton, SemanticUI, Gumby, Siimple etc. All claim easy of use, simplicity, speed and other advantages but so far Bootstrap framework seems to be the most popular framework for building layouts for webpages that are responsive. You could use any framework, but bootstrap layout builder is the one dedicated to Bootstrap framework. In the future we plan to release a tool ( in addition to the bootstrap builder ) that can allow you to build on top of other frameworks of your choice apart from bootstrap. ! Most such frameworks will give you a grid based layout, UI elements like navbar, carousel, button, table etc. Such a grid based design will help you design and customize your web page for multiple form factors such as phones, tablets, laptop, desktop.