Coming from a world of Java, you may see a lot of shortcomings in the Flex world and wish you could have things like a logging tool (log4j), a lightweight IoC-container (guice) and a mocking framework (easy mock). All this is covered by FxPotpourri.
Interfuse is a workflow framework that joins ("fuses") the services, rules and objects of a traditional application with user-defined workflow. Interfuse is lightweight and designed to be embedded in existing Java-based applications.