Looking for template with visual page builder

Hi all,
I’m a coach for CoderDojo (coderdojo.com/), a non profit organisation that learns children between ages 6 and 18 to program. I want to do a few workshops about wordpress and am looking for a template that has a visual page builder.

It has to be a free template or a commercial that has a non-profit program (we don’t have a any money, everything is done by volunteers and corporate sponsors).