A pretty handy page to test your responsive HTML/CSS code
openSIS is a commercial grade, secure, scalable & intuitive Student Information System, School Management Software from OS4ED. Has all functionalities to run single or multiple institutions in one installation. Web based, php code, MySQL database.
The original Responsive WordPress Theme, downloaded over 1 million times.
Responsive Mobile, the successor of Responsive (wordpress.org/themes/responsive), the most popular WordPress theme in the world.
A responsive WordPress theme
A Responsive [WordPress] theme built with Foundation for Sites -
Allowing PHP to access device screen width for use in Lukew's RESS (Responsive Design + Server Side Components) suggestion
Responsive Web Design by Example published by Packt
A WordPress theme built on the NASA Web Design Standards