Lots of folks asking exactly what Dark is so answering separately.
tl;dr Dark is a programming language and service. Our goal is to allow you to build backends without having to deal with the endless accidental complexity in software today. (Accidental complexity meaning everything from infrastructure and storage, to syntax errors, etc).
What does that mean exactly? Dark is a language, and editor and a PaaS, combined. We're aiming to allow you build an application in an afternoon.
One thing to bear in mind: we are very early on this, so it's buggy and doesn't have all the featured you'd need. This will literally be our first user, so set your expectations from that :)