FlashLabWeb Experiments by Brian Wiltshire

De MonsterDebugger is an open source debugger for Adobe Flash, Flex and AIR. De MonsterDebugger is made in Flex and AIR by design studio De Monsters.

Some of the main benefits of using this monsterdebugger

Tree structure.

When De MonsterDebugger is connected with an application it will show the structure of the application and show it in a tree structure. This allows you to walk through your entire application and inspect every little detail if you like. When you click on an object that is on the stage at that time, it will highlight, showing a clear connection between the structure of your code and its visual representation.

With large applications the tree can become quite big, so to make sure that you can find exactly what you need you can filter the tree. And to make sure that your application does not slow down, only those elements of the tree that you open are loaded.

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AlivePDF is AS3 open source library which enables to generage PDF files within flash.

Currently it is in the alpha phase, but you can use it to create and save simple PDF documents.
Check it out : http://www.alivepdf.org/