semmu

Don't let this fool you, you can still create 2, 3, 4, 5, or even 6 column rows, also with nested grids you can create a 12 column row too.

This is my favorite frontend framework ATM. I have used Zurb's Foundation and Twitter's Bootstrap too for fairly big projects and I found UIkit to be the best of both worlds. The markup required for it to work is much smaller than with Bootstrap, it looks great, the grid system is flexible, it has a ton of official javascript components, so this framework is pretty great. I highly recommend it.