1) CSS3 Buttonize Framework
A easy starting point for creating modern looking buttons on your site, with very little effort involved. With different effects like hightlight and disabled with just a class addition.
2) 52 Framework
The 52 Framework is all about the features. It boasts many HTML5 features like local storage and video already setup.
3) Less Framework 4
HTML5 Grid Template designed for desktop and mobile handheld use. It has this to say about itself: “Less Framework is a CSS grid system for designing adaptive websites. It contains 4 layouts and 3 sets of typography presets, all based on a single grid.”
Useful Links
15 Useful CSS3 and HTML5 Templates and Frameworks – speckyboy.com
GRIDLESS – HTML5 & CSS3 FRAMEWORK WITH BEAUTIFUL TYPOGRAPHY – blogfreakz.com