ColouriseSG - Deep learning colouriser prototype made for old Singaporean photos.

GIMP - GIMP is a multiplatform photo manipulation tool.

Image Colorizer - Colorize black and white images automatically

Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.

Colorize It - Use deep learning to colorize black and white photos

MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.