What are some alternatives?
When comparing ReadyNAS and Serveo, you can also consider the following products
FreeNAS - FreeNAS is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
Portmap.io - Expose your local PC to Internet from behind firewall and without real IP address
Rockstor - Rockstor is a free and open source NAS (Network Attached Storage) operating system.
sish - An open source serveo/ngrok alternative. HTTP(S)/WS(S)/TCP Tunnels to localhost using only SSH.