FxStruts is a free open source library with the taglib part licensed under the Apache License 2.0 and the serialization part under the LGPL 3.0 that provides replacements for Struts (version 1.x.x) JSP tags <bean:write/> and <bean:message/> that outputs AMF or XML from any Java object with ActionErrors and transaction token support. FxStruts is present both on the Flex and Java side.

Note: Struts 2 is an entirely different beast and currently not supported by FxStruts.

FxStruts Taglib is licensed under the Apache Software License, 2.0. The serialization bit is licensed under LGPL. Therefore they are distributed as two different JARs due to the licensing.

The HTTPAMFService component, FxStrutsMailReader and HelloWorld Flex application is licensed under the MPL 1.1.

For more details, see this blog post.