If you're saying "server-side PHP/Ruby API + React SPA frontend", you'll probably be able to find some boilerplates on a github search, but essentially they're just two separate apps at that point, so you're better off just building them that way and maybe tying them together with `make`. If you want server rendered React you can only really do that with Node.js. However the specific architectures/implementations of these apps vary enough its better to make one yourself that suits your needs. create-react-app is designed to have very minimal, bare-bones defaults so you can build whatever opinions you want on top of it.