Cairngorm (Flex Framework)
Cairngorm is one of the primary open source frameworks for application architecture in Adobe Flex. It was developed by iteration::two, who was acquired by Macromedia in 2005. It is part of the Adobe Engagement Platform.
Adobe Labs features Cairngorm as the architectural framework for Rich Internet Application programmers.
Read more about Cairngorm (Flex Framework): Model View Controller Based Architecture, The Nature of A Cairngorm Application