The ServeBox ActionScript Foundry (AS Foundry) is an ActionScript 3 / Java framework designed for Flex application development. Its design is based on several design patterns, and includes tools built to resolve some of the recurrent Flex development issues: model-view data synchronization, screen-browsing, access-control lists, localization and label externalization, etc.

It is available as an open-source project under the Apache 2.0 license, so you are free to use it for commercial and/or open-source projects.
The framework is composed of five libraries:

• Commons: basic types and tools;
• Foundry: provides the micro-architecture classes;
• AirFoundry: extends the micro-architecture so it can be used in Adobe AIR;
• Toolbox: high-level tools (browsing, ACL, dataprovider items search, etc);
• Foundry-Java-Commons: Java helper classes, built to structure and accelerate (Flex) Client / (Flex Data Service -LiveCycle Data Service - BlazeDS) Server development.

Direct link to dowload the Foundry.
Website for Open Source Software: www.ServeBox.org