Kuorinka is an accessible, translation-ready theme. It supports right-to-left languages, Schema.org microdata, and some more!
@samikeijonen is one of the best WordPress theme developers in the world.
Looking through its code is like reading a best-practices manual. Add in the fact that it’s also accessibility-ready makes it nothing short of a work of art.
EDD, Paytrail Payment Gateway and Paytrail are cheap and functional solution for selling digital products.