[Pharo-users] Is BuildingApplicationWithSpec2 project dead?

Hi . I'm talking about the Spec2 book located at https://github.com/SquareBracketAssociates/BuildingApplicationWithSpec2 . This book was really helpful to get me started with building GUI . However, it is obviously incomplete and there is a message from a maintainer (Stéphane Ducasse) inside the book stating that he'll stop working on it. Moreover, pull requests from Stephan Eggermont and rvillemeur have been waiting since last year. So, Is this book project dead and what are the alternatives? Regards.