This is the Eye of MATE, an image viewer program.
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MyPaint is a nimble, distraction-free, and easy tool for digital painters.
Tonbe
Krita is a FREE and open source painting tool designed for concept artists, illustrators, matte and texture artists, and the VFX industry.
Inkscape
Inkscape is an open-source vector graphics editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X.
Imajine
Imagine is a desktop app for compression of PNG and JPEG, with a modern and friendly UI.
HandBrake
HandBrake is an open-source video transcoder.
GIMP
GIMP is a cross-platform image editor.
Konvèti
With Converseen you can convert, resize, rotate and flip an infinite number of images with a mouse click.
Cyan
The ciano is a multimedia converter for all the format you need.