Adobe flash has become a defacto standard for rich content over the internet. Whether is animation, video or cool looking interactive web pages, web developers trun to flash for development.
However, small developers from poorer countries cannot afford expensive licenses for flash. But, they do have excellent opensource alternatives for developing flash content .
Continue reading about 11 Great Opensource Alternatives for Flash Development
QFlash is a c++ open source IDE to create flash (swf) animation files. It uses ming and qt libraries.
F4L is an open source development environment for Macromedia Flash, a multi-platform format(swf/svg) widely used for web applications and vector animation. Basically, you can make interactive eye candy for your web site or any other purpose
Open Dialect is an Open Source Flex based Flash IDE. Open Dialect is written in C# using the .NET 2.0 framework and has been ported via Mono and GTK+ to Linux and partially OSX. The purpose of this software is to create Interactive Learning Environments, hence the name (Dynamic Inter-Active Learning Environment Creation Tool). If you are interested in the goals and implications for the field of System Dynamics of Open Dialect continue reading, otherwise enjoy what amounts to (for the time being) an Open Source Flash IDE. 
AnimationPackage is an ActionScript library compatible to Flash Player 6 and above. It helps you to create powerful, maintainable animations and primitive shapes in an efficient and easy way, resulting in small file sizes.