ReplacePhotoshop.
Krita
Digital painting app for illustration and concept art
GIMP
Raster image editor for retouching and composition
Photopea
Browser-based image editor that opens PSD files
Paint.NET
Lightweight image and photo editor for Windows
Affinity
Vector, photo and layout design in a single app
Krita
GIMP
Photopea
Paint.NET
Affinity