boringproxy is a combination of a reverse proxy and a tunnel manager.

What that means is if you have a self-hosted web service (Nextcloud, Emby, Jellyfin, etherpad, personal website, etc.) running on a private network (such as behind a NAT at home), boringproxy aims to provide the easiest way to securely (i.e. HTTPS and optional password-protection) expose that server to the internet, so you can access it from anywhere.

Source: boringproxy.io