Helix3 is a user-friendly, highly customizable and easy to integrate solution to build your custom Joomla 3+ website. For users installing Helix3 for the first time on a site, we have nice surprise all advanced template settings are already here.
BOOTFLAT is an open source Flat UI KIT based on Bootstrap 3.3.0 CSS framework. And, for the designers, they offer a free PSD Download.
BOOTFLAT is an open source Flat UI KIT based on Bootstrap 3.1.1 CSS framework.