ShellHub is a modern SSH server for remotely accessing Linux devices via command line (using any SSH client) or web-based user interface. It is intended to be used instead of sshd.
Typically, if you want to SSH a Linux device on a local network, you just need to know its IP address. However, in order to access a Linux device from outside the local network, you will have to go through a few inconveniences, such as getting its public IP address and configuring the router. Changing the VPN/firewall configuration can be cumbersome if the device is behind a corporate firewall that does not allow SSH connections.
ShellHub provides a way to avoid all these hassles, helping you easily and seamlessly access any Linux device behind firewall and NAT.