Adobe is releasing the “goods” to Flex including “core ActionScript libraries ” under the Mozilla Public License. The overview on that page says that everything needed to run a little flashy goodness is available in the license.
Now lets see if the project gets some traction. It’ll be a really interesting view to see how Adobe plays these cards. We’ve already seen how Sun did with Java (or not, in the case of open sourcing the language). I’ll let you come to your own conclusions on the effectiveness and general “goodness” of Sun’s tactics. I think the only components remaining closed behind Adobe doors is the player itself…