Free Flat UI Design Kit

1. Flat design UI – HTML5 + CSS3

This is a free flat design UI kit where you will find the HTML5 and CSS3 codes for free.

2. Responsive Flat UI kit – HTML

This UI kit allows you to work alongside the latest version of Bootstrap.

3. Light UI Kit in CSS & HTML

If it's features that you want, this UI kit has plenty to offer.

4. Bootflat – Flat UI kit for Bootstrap

BOOTFLAT is an open source Flat UI KIT based on Bootstrap 3.1.1 CSS framework.

5. Free PSD & HTML Flat UI kit

This is a flat design UI kit that is available in both PSD and HTML forms to suit your needs.

6. Flat Admin UI kit

This is another flat UI kit that you can use. Unlike other options though, this one is meant especially for administrators.

7. Email UI kit Dashboard

This is a very useful UI kit that was first designed to be used for email user's interfaces. It has dashboard elements.

8. Free PSD/HTML Web UI Elements Kit

This is a web user interface that is available in PSD, HTML, CSS and jQuery formats.

9. Futurico UI HTML

This is a web user interface for designers and developers, which is based on the free version of the Futurico web UI.

10. Web UI CSS kit

A lightweight and modular front-end framework for developing fast and powerful web interfaces.

Original Source: http://efytimes.com/e1/fullnews.asp?edid=137969