Apps with 'Digital-painting focused' feature

Krita is a professional Free and open source (FOSS) painting program. It is made by artists that want to see affordable art tools for everyone within concept art, texture and matte painters, illustrations and comics.

Procreate is a multi-award winning, creative illustration app built from the ground up for iPad with a pocket-sized variant for iPhone. The app features a complete, professional toolset that's accessible while still providing the power and flexibility of desktop counterparts.

MediBang Paint is a lightweight software for illustration and making comic books on Windows and Mac OS.