backend is made following this tutorial of setting up an Apollo server.
It is not connected in docker-compose.yml.
To run it, use docker-compose-backend.yml.
backend2 is an API server made following this tutorial for Node + JavaScript + Apollo Server backend.
frontend is a React frontend made following this tutorial for React + Apollo client frontend.
backend2 and frontend are accompanying tutorials.
django is an API server made following this tutorial for Python + Django + Graphene.
To run it use docker-compose-django.yml.