NGINX (pronounced as engine-x) is a versatile (reverse) proxy service for Linux which can be used for many purposes. This post gives a relative small and easy example that I use at home for accessing insecure web services in my home. These are:
Free and opensource Domotica software
Free and opensource software for downloading binaries from usenet. Available for multiple operating systems
(former NZBDrone) is a so-called PVR (personal video recorder) for Usenet users, which checks multiple RSS feeds (also called Indexer) for new episodes of the shows you're following.
These services run on different platforms and are not protected by username/password or encryption. Something that's not done if you want to access this over the Internet.
To get secure access to these services you might want to use a VPN solution into your home, but you can also achieve this by using a reverse proxy that 'protects' these services.
I run my NGINX reverse proxy on Ubuntu Linux, but it will also run on the average Raspberry Pi.