Looking for software to make animated 2d loops(not aftereffects)

I came across a tutorial to make an energy orb

Basically a gif of alphas making a nice wobbly looping animation

But it uses Aftereffecs, I dont really want to fork out for a license for this. So my question is are there any other “indie dev” focused applications focused on making procedural looping animations? After a lot of googling I have realised I dont know what to actually search for and either end up reading about video editors or coming across this same tutorial for the 100th time.

Thanks.