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Blenderblender.orgFree, open-source 3D: modelling, rendering, animation.
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MagicaVoxelephtracy.github.ioFree voxel art editor and renderer.
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Penpotpenpot.appOpen-source design and prototyping, self-hostable.
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REXPaintgridsagegames.comASCII art editor made for roguelike developers.
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TAAGpatorjk.comText to ASCII Art Generator: hundreds of FIGlet fonts.