It's a new application called gWeb. It's extremely simple.
The service was free for all, until this week. Thats means the people like me who signed up before this week, get free lifetime access. The users who sign up now, have to $1.50 per month, or $12 per year. They give 60 days free trial, though.
Enjoy hosting static sites on GDrive, and having them on custom domains, easily!