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Flat UI Free is made on the basis of Twitter Bootstrap 3 in a stunning flat-style.

Flat UI Free contains many basic and complex components which are great for designers to have at hand: buttons, inputs, button groups, selects, checkboxes and radio-buttons, tags, menus, progress bars and sliders, navigation elements and more.
We have considered your needs in developing the HTML version of our bootstrap theme, which contains the same elements as the PSD version and are perfect for creating great websites. With this Framework, you can spend even less time on routine work, saving that time for creativity.
Colored, stylish icons can easily be modified and used in a wide variety of projects, as they contain original layers. Glyphs are also available in psd, html/css and svg formats.



HTML version of Flat UI includes:

Twitter Bootstrap 3 Framework based
Retina Ready Images and Icons
Custom form components
Sleek CSS3 effects
OOCSS approach
Easy configurable color scheme
New web-font and new web-font icons

PSD version of Flat UI includes:

PSD files
Layered (Shapes)
Retina Ready
Color swatches
Glyphs – svg format
Free font used – Lato

Download PSD: https://dl.dropbox.com/u/21385868/design...I-Free.zip
Download HTML: https://github.com/designmodo/Flat-UI

I personally use both versions of it, it is great for web design.
I use the PSD to design the website in Photoshop.

And the PSD version also contains cool stuff for thread designs and whatever you want.

If you would like to buy the pro version (Contains way more stuff) you can do that here: http://designmodo.com/flat/