Well…you didn’t noticed UIKit I guess?
Indeed, I had not (or had pushed it out of my mind for whatever reason). Interesting. There was once a time when YOOTheme only did Joomla but I guess with WP’s increase in popularity and Joomla’s slow decline they have continued to diversify. I haven’t looked at them (YT) since the Warp 6 days, I think. It’s nice to see Warp 7 finally include LESS.
I’m currently checking this one out. It seems very well documented.
Semantic UI – http://semantic-ui.com/
A WordPress theme that uses it – https://github.com/ProjectCleverWeb/Semantic-UI-WordPress
@eriktailor – Yes, a definite oldie but goodie. If it ever supported more than an 960 grid out of the box, I might consider it. For my projects the grid is just way too small.