This is a fractal video making software with a graphical user interface (GUI), written using C++ with Qt, and FFmpeg is bundled for video encoding. Check out the GitHub repo for more details!
Fractal Designer (FRD) is open source under the MIT license.
Fractal Designer supports any fractal formulae, and provides preset fractals for easier use: Mandelbrot Set, Julia Set, Newton Fractal, and Burning Ship.