Cloud Imperium was at Gamescom granting attendees limited time free access to the Dogfighting module in Star Citizen, their upcoming space combat game. This is being handled through this page, and DSOGaming offers the instructions on how to get in, saying it is open to all for free until August 19th (we have not yet hazarded the 26 GB client download to confirm this works). Here are the instructions they provide on how to get in:

Go to https://robertsspaceindustries.com/promotions/gamescomflyfree2015.
Choose Enlist Now to create a new account.
Once the account is created, enter GAMESCOM2015 into the coupon field and hit Apply Coupon.
You’re now good to go with your account and will have access to all flyable ships.