Sshreach.me is a service which can create remote-controlled, zero-configuration secure tunnels to your computer.
It allows you to expose a service (like web server or ssh server) on your computer or your local server to the Internet by creating encrypted “tunnels” to the predefined access points. You can then remotely open those tunnels when access is needed and close them when you no longer need them.
If you are a web developer, you can allow your client to see your work in progress on your development computer. There is no need to set up temporary web servers.
If you are a system administrator and you administrate one or more servers behind the firewall, you will be able to remotely initiate the tunnels and access the servers.