Krita

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https://krita.org/en/

Krita is a professional free and open source painting program. It is made by artists that want to see affordable art tools for everyone. It specializes in concept art, texture and matte painters, illustrations and comics. Krita uses the Scalable Vector Graphics (SVG) file format.

See an introduction to Krita coming from Photoshop, if you already know Photoshop.