GIMP
Open Source
GIMP stands for GNU Image Manipulation Program which is an opensource image editor program supporting almost every popular image formats.
Photopea
Free
Photopea is a free online image editor, that runs without plugins. It can both read and save PSD files.
Darktable
Open Source
Darktable is a free and open-source photography workflow application and raw developer.
Compare PhotoFiltre with alternatives
Compare Darktable and PhotoFiltre and decide which is most suitable for you.
Compare Photopea and PhotoFiltre and decide which is most suitable for you.