jHipster

I admit that I only use it on my personal projects. But it generates you whole project. The most clean code I have ever seen. It also creates you all tests and documentation. And the most important swagger API. So if we continue In few steps you have api library for any language using swagger codegen. It is priceless so many saved time. It saves you years of coding on bigger project. Only thing you have to do, is to tell it what technologies you would like to use (ex: elastic search, web sockets, database type, ...) And ER DB diagram.