We have long been providing a solution to Flex developers, and have recently released a version of our product that supports JavaFX 2.2: [Granite Data Services|http://www.graniteds.org] (GraniteDS) is a comprehensive development and integration solution for building Flex (and now JavaFX) / JavaEE RIA applications. The entire framework is open-source and released under the LGPL v2 license.
To know more about what GraniteDS provides to JavaFX developers, see a comprehensive documentation here.
The full announcement about this new 3.0.0.M1 version is available here, together with several links to tutorials and resources. This first public release of a GraniteDS for JavaFX is clearly in a beta stage at this time, but with the help of your feedback, we hope to be able to provide new milestones and a stable 3.0.0.GA within the coming months.