ORM structures are designed to access the database. Since Flex does not have direct access to the database, the ORM structure will be extremely limited.
I assume that the projects you are referring to are designed to work with AIR and the SQLLite embedded database.
There are plugins for Flash Builder that will generate value objects based on the database you specify. Originally they were intended only for ColdFusion, but I think they have expanded to include other technologies. However, I would not consider these "code generators" as ORMs.
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