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GTK based 2D Animation software released under GPL

GTK
GTK

A new professional and very powerful 2D animation product has been open sourced after the company behind it failed to find enough customers. Synfig, which uses gtkmm (screenshot), has now been released completely under the GPL and it's still very actively maintained by its original author, Robert Quattlebaum.

Inkscape

You can do 2), 3) and 4) in SVG (subject to some limitations), actually, even if Inkscape hasn't implemented those portions of the SVG standard yet.

But I think you're right about issues of workflow and internal representation (and I'd suggest there would simply be UI impedence mismatches as well).

-mental