If you create a BlackBerry 10 app with the Marmalade SDK (you can download an evaluation version for 30 days) and have it approved in BlackBerry World - the generous Marmalade people will give you a free Indie license worth $499.
As well as that, if you are one of the first 300 developers to qualify - you will also receive a free Dev Alpha device!
Marmalade is a well established cross-platform software development kit. So if you're considering creating apps or games with this software, now is the time to give it a go!
More information: Marmalade for BlackBerry 10 Program