If you are interested in AS3 the UML modeling tool, you can look at the following tools range in price from $ 0 to $ 239.
0.UML4AS - (free with paid ... Eclipse-based plug-ins)
1.gModeler - free (line modeling)
2.Cairngen - Free
This tool provides a framework based on Cairngorm Flex AS3 code generation projects. Need to install Ant, if the call to ant-based Cairngen the GUI interface better.
3.VASGen - Free
There are several problems, do not support the package name, but the AS3 code generation is very perfect .. If you consider the price of the Chinese, this tool is worth using. If you do not plan to use the Cairngorm want to find a free, which seems to be a good program.
4.UMLet - Free
Can be used as Flex or Eclipse plug-ins. Very cool, no code generation.
5.Enterprise Architect - $ 239 - $ 135
Needless to say .... EA online information ... price of your lot.
6.Visual Paradigm - $ 70 - $ 59
Visual Paradigm claims to support AS3 code generation, but I have some " concern . "