GIMP
Free, full-featured image editor.
Open SourceFree· OSSNo ratings
#Graphics
Sites tagged with Graphics.
Inkscape
Professional vector graphics, free.
Open SourceFree· OSSNo ratings
Krita
Painting software made by artists.
Open SourceFree· OSSNo ratings
Unreal Engine
AAA graphics, free until you ship big.
Game EnginesFreemiumNo ratings