ScalaBlitz is Open Source Software and is available under the Apache Licence. Roughly, this means that you can use it freely in any commercial or non-commercial project, redistribute it or modify it. It still requires application of the same license to all unmodified parts and, in every licensed file, any original copyright in redistributed code must be preserved and, in every licensed file changed, a notification must be added stating that changes have been made to that file.
Unless explicitly stated otherwise, any contributions submitted will be under the terms same license without requiring separate agreements regarding these contributions.
See the full license here.