Cazabe is a free vector animation IDE.
It was a FLOSS replacement for Adobe/Macromedia Flash written in Qt/C++.
The .cz format was created to save flash projects done with Cazabe. The cz2swf tool (see https://github.com/0xdac/cz2swf) outputs a .swf movie from a .cz file.
The project is dead since 2011. If you or your organization are interested or have questions feel free to contact me at email@example.com.
For more details visit https://0xdac.org/cazabe.html