SlackBuildsOrg/graphics/synfig

Synfig (Professional vector animation program, CLI)

Synfig is a free and open-source 2D animation software,
designed as powerful industrial-strength solution for creating
film-quality animation using a vector and bitmap artwork. It
eliminates the need to create animation frame-by frame, allowing
you to produce 2D animation of a higher quality with fewer people
and resources.