Responsive web design is new trend as we know now people are using different devices to surf internet like smart phones, tablets etc... There are main three elements to make a responsive web site like:

1.   A flexible/ fluid grid
2.   Responsive images
3.   Media Queries

Here we have mentioned and focused on some good tools to making your sites more responsive.

-   Responsive Web Design Sketch Sheets
-   Responsive Wireframes
-   Multi-Device Layout Patterns
-   Style Tiles
-   Golden Grid System
-   Simple Grid