Cazabe was a FLOSS replacement for Adobe/Macromedia Flash written in Qt/C++.
The project is dead since 2011. If you or your organization are interested or have questions feel free to contact me.
Here you can download the last two versions of the source code I published at that time:
I also created the .cz format (to save flash projects done with Cazabe) and the cz2swf tool (Bash and C++. Given a .cz file it creates a .swf movie.)
Making an SWF movie and playing it with Gnash Free Flash Player.