Maisha is a GPL licensed theme, which is pretty cool. But, maybe it’s not exactly what you were looking for. If not, we’ve got a whole collection of GPL licensed WordPress themes to choose from.
The developer says this about Maisha.
Maisha is a beautiful charity WordPress theme inspired by “Virunga” documentary. It is modern, responsive and mobile friendly theme. So, no worries there, Google will love it. Theme offers whole variety of cool features like different blog layouts, different header options, extensive color options and more. It is all very easily customizable directly from the WordPress customizer. Maisha also comes with number of page templates and includes a couple specially styled to support hugely popular plugins like bbPress, BuddyPress, WooCommerce and Events Calendar. Above all it is very easy to use, coded according to the latest standards and SEO friendly.
It’ll be interesting to see how popular this theme is. I love the design, the responsiveness and the user friendly setup for customizing it, so I think it should do quite well.