Wonderfl is a new service that will let you create and build Flash projects in your browser, and at no cost whatsoever. The way that is achieved is pretty direct: you just type in your ActionsScript3 in html code form, and then the server will proceed to compile the code.
Any error that has been found on the code will be displayed in real time, so that the process is quite an action-packed one.
The site also makes for communicating and collaborating with other users, and in that way you can not only get feedback but also provide others with your very own insight. The way that is implemented is also quite smooth, since you can post code snippets and tag them with a “question” label. Others will (hopefully) be able to fix it for you.
And if what you have developed is actually a Flash game, you will have an excellent excuse to get down to playing while you are working, and also inviting others to try your games out. I mean, you are testing what you have come up with. It is all part of your job, isn’t it?
Wonderfl.net In Their Own Words
“Create Flash in your browser, for free.”
Why Wonderfl.net It Might Be A Killer
It makes for compiling Flash code in an entirely supple way.
Some Questions About Wonderfl.net
Will this site always remain free to use? 
