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 can be used for concept art, texture and matte paintings, illustrations and comics.
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Ren'Py
Ren'py is a free and open source Visual Novel Creator.
Work centered on following a character through the ups and downs during a notable part of their life. There's often more of an emphasis on characterization, relationships, and a series of dramatic events than on strict adherence to conventional story structures and plotlines.