Open source Image editors for macOS

GIMP

The GNU Image Manipulation Program, or GIMP, is a raster graphics editor used to process digital graphics and photographs. (GPL)

Linux - FreeBSD - Windows - macOS

LazPaint

LazPaint is a free cross-platform image editor with raster and vector layers. It supports the OpenRaster format so it can interoperate with MyPaint, Gimp and Krita. (GPL)

Linux - Windows - macOS

Pinta

Pinta is a drawing/editing program modeled after Paint.NET. It's goal is to provide a simplified alternative to GIMP for casual users. (MIT)

Linux - macOS

Tux Paint

Tux Paint is a free, award-winning drawing program for children ages 3 to 12. (GPL)

Linux - FreeBSD - Windows - macOS

4 applications