0. There is not 'the best' and you don't really need it, as Flex/AS3 itself is already capable of MVC/MV(V)P itself. 1. Tide (GraniteDS) - most complete solution replacing BlazeDS/LCDS. Tide is GraniteDS's IoC framework. I'd pick this for a new project. [1] 2. Parsley (my favorite) - IMHO the best decoupling framework out there. It's great and has everything you need for MVC/MVP or IoC/DI. We love it. [2] 3. Swiz - might be donated to Apache soon. Haven't used it myself in production, but gets recommended every now and then. [3] 4. Some more here: http://www.spoon.as/ecosystem/application-frameworks/
[1] http://www.graniteds.org/ [2] http://www.spicefactory.org/parsley/ [3] https://github.com/swiz/
