You can try it out at jobb.meteor.com
Pre-requisites:
->You should have nodejs already installed on your computer.
->You can download it from nodejs.org
Once you've node installed, clone this repository to your desktop.
Next cd into the repo from your terminal and run meteor. Like this:
$ cd directory
$ meteor
You'll find the app running at http://localhost:3000
Then? Just play around. Add your own code. Make it better. Pass it on. The choice is yours.