Nginx Proxy Manager is described as 'This project comes as a pre-built docker image that enables you to easily forward to your websites running at home or otherwise, including free SSL, without having to know too much about Nginx or Letsencrypt'. There are three alternatives to Nginx Proxy Manager for Linux and BSD. The best alternative is Træfik, which is both free and Open Source. Other great apps like Nginx Proxy Manager are TinyProxy (Free, Open Source) and Haproxy (Free, Open Source).
Træfik is a modern HTTP reverse proxy and load balancer made to deploy microservices with ease. It supports several backends (Docker, Swarm, Mesos/Marathon, Consul, Etcd, Zookeeper, etc.) to manage its configuration automatically and dynamically.