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Re:HTTPS-Portal: Automated HTTPS server powered by Nginx, Le... by bpizzi on Friday September 14, 2018 @03:27AM (#17985344)
It's not free if you use the binaries builded/downloaded from caddyserver.com. It's still free if you build the binaries yourself from source [0].

[0] https://caddyserver.com/products/licenses

Re:HTTPS-Portal: Automated HTTPS server powered by Nginx, Le... by morpheuskafka on Friday September 14, 2018 @11:17AM (#17987797)
And there is a Docker Hub image freely licensed building from source: https://github.com/abiosoft/caddy-docker
Re:HTTPS-Portal: Automated HTTPS server powered by Nginx, Le... by andmarios on Friday September 14, 2018 @06:11AM (#17986026)
Binaries from github should also be free, though they do not have external plugins compiled in.
Re:HTTPS-Portal: Automated HTTPS server powered by Nginx, Le... by edwinyzh on Friday September 14, 2018 @05:39AM (#17985893)
Great! I didn't know about that.