Ol logez is a free responsive Joomla 3.x and joomla 2.5 template based on own framework. Bootstrap Framework can be used only for joomla 3.x versions.
Black and White theme features a lightweight design with a few images for decoration, which makes it super-fast in loading time.
Afterburner2 is an experiment in how streamlined a Gantry Framework Template can be, whilst still being visually enticing and usable on a live site.
inResponse is a responsive Joomla! 2.5 template based on the Twitter Bootstrap framework. It's for people to learn how Joomla! templates work and as a basis for tinkering.