What are some alternatives?
When comparing Portmap.io and Pagekite, you can also consider the following products
ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
Serveo - Use SSH to expose local servers over the internet and inspect and replay HTTP traffic.
sish - An open source serveo/ngrok alternative. HTTP(S)/WS(S)/TCP Tunnels to localhost using only SSH.
VPSSIM - VPSSIM provides installer enabling users to install LEMP stack on their servers.
Forward - The easiest way to share localhost over the web.
CentminMod - Centmin Mod is a LEMP stack shell menu based auto installer.