There are several free and open source photo editing software options available. Some popular ones include:
GIMP
GIMP (GNU Image Manipulation Program) is a popular open source photo editor that is available for Windows, Mac, and Linux. It has a wide range of features, including support for layers, masks, and filters, as well as a variety of retouching and color correction tools.
Darktable
Darktable is a photo editing software for Linux, with versions also available for Windows and Mac. It has a range of features including support for raw image files, non-destructive editing, and a variety of color correction and retouching tools.
RawTherapee
RawTherapee is a photo editing software for Windows, Mac, and Linux that is specifically designed for editing raw image files. It has a range of advanced features, including support for a variety of color spaces, and a variety of color correction and retouching tools.
digiKam
digiKam is a photo management and editing software for Linux, with versions also available for Windows and Mac. It has a range of features including support for raw image files, a variety of color correction and retouching tools, and the ability to organize and tag photos.
Inkscape
Inkscape is a vector graphics editor available for Windows, Mac, and Linux. It has a range of features including support for layers, masks, and filters, as well as a variety of drawing and text tools. It can also be used for basic photo editing tasks such as resizing and cropping.
