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.
MyPaint
Open Source
MyPaint is an easy-to-use painting program which works well with Wacom graphics tablets and other similar devices.
