I knew for a long time now that flash had undocumented features, little part of flash that could help speed up process (like the memory opcodes) or make interaction easy with right click and that kind of things. But I never thought that FlashPlayer would hide data that could help find bugs, or give better knowledge of how flash is interpreted.

Allows you to upload files using HTML5 Gears, Silverlight, Flash, BrowserPlus or normal forms, providing some unique features such as upload progress, image resizing and chunked uploads.

Gordon: An open source Flash runtime written in pure JavaScript

Flash + Javascript library which allows you to display a variable-sized Flash movie in your page that captures Webcam snapshots (still frames), and submits them to your server in JPEG format. Sample PHP 5 code included for receiving submissions and saving them to disk.
The Flash movie first activates the webcam and allows the user to make adjustments before submitting. All controls for displaying the Flash device configuration panel and taking snapshots is handled from Javascript. This way you can control the user interface, using your own buttons and layout. The Flash movie consists of nothing except a full-canvas camera control with NO flash user interface elements.

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.

for a recent project (that almost cost me my sanity) I came to re-open illustrator. I hadn’t for years.
it’s really a great soft btw one of my favorite with fireworks.
can’t remember since when it features that very cool ‘custom stroke’ thing.
you draw something and then choose some shape for the the stroke.
you can even draw your own shapes.
so last friday I told myself why not trying it in flash and off I went.

FLVSlicer allows you to extract a "slice" of an FLV at runtime, but also merge multiple slices if you need to. The library may be really useful if you want to get a specific part from an FLV with no server involved. Ley's say for instance that you are looking for a specific text content in a video and you would like to save it on your hard disk or post it on youtube.

SilverX supports all basic Flash features: vector primitives, images, texts and animations, so almost all Flash movie resources get accurately converted to Silverlight.

The Collision Detection Kit is a package of classes created for pixel-precise, shape-based collision detection for all display objects. It is written in Actionscript 3.0 and meant for Flash Player version 9 and higher. The Collision Detection Kit comes with several features to control how collisions are detected, and provides data for the user of the class so they can do something about the collision: