The use of the Quickly development tool is no longer a requirement for participants entering the Ubuntu App Showdown Contest.
By allowing developers to craft applications in languages other than Python, the contest will open itself up to a wider range of participants.
Applications submitted will still need to include some form of Ubuntu integration, and should not depend on libraries or packages outside of the Ubuntu 12.04 repository.
So, if you were put off of entering because of the Quickly requirement you can proceed to join in the fun when the contest kicks off on June 18th.
For more information on the contest, its prizes and its rules, refer to developer.ubuntu.com/showdown/