This is a simple processing programm that creates times tables with a variable factor (times 1 times 2 times 3...)
Coding Challenge #133: Times Tables Cardioid Visualization
Times Tables, Mandelbrot and the Heart of Mathematics
To create a gif you just need to run times_tables/times_tables.pde which outputs all frames as png files. Those need to be converted to single gif files with the times_tables/output/convert.bat. After that all the gif files can be stitched together to one file with times_tables/output/gif.bat.
There are a lot of tweaks you can do to the design in the pde. The bat files are very simple and can easily be replicated with bash if you need to.