showoff.io is a really neat tool that lets you tunnel a port on your local system to a public URL, so that you can share your work from your local computer with people that aren’t necessarily on your network. It’s a piece of cake to set up:
> gem install showoff-io > show [port #]
Once you run the show command, you’re given a link that you can share with anyone that you would like to see the local site that you’re working on. It’s super useful for communicating what’s going on with an app or site during development.