GIMP
Bitmap editor suitable for photo retouching, image composition and image authoring.
Graphics
Pinta
Simple image and photo editing tool for Windows.
Inkscape
scalable vector graphics format (SVG) drawing tool
ImageGlass
Verstaile image viewer for over 30+ image file formats.
Blender
Create interactive 2D and 3D content including visual effects, animated movies, and physics modeling.
draw.io
A diagram creation program to create flowcharts, network diagrams, user interface mockups and more.
ShareX
Capture or record any area of your screen.
digiKam
Photo management application to import, manage, edit, view and share your photos and RAW files.