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Re:Spritestack – 3D pixelart editor based on sprite stacking... by deaddodo on Thursday March 07, 2019 @01:14PM (#19330505)
> As far as I know, the available open-source tools that are suitable for producing pixel art, are strictly flat-2D-only.

There are plenty of voxel editors out there:

https://ephtracy.github.io/

I'm not sure how "stacked sprites" differ from voxels, since this appears to be the same technique Westwood used in it's voxel engine; but voxels are the traditional "3d" pixel art.

Re:Spritestack – 3D pixelart editor based on sprite stacking... by joepie91_ on Friday March 08, 2019 @09:27AM (#19337699)
That voxel editor isn't open-source either, though.