Open source Image editors for Linux

GIMP

The GNU Image Manipulation Program, or GIMP, is a raster graphics editor used to process digital graphics and photographs. (GPL)

Linux - FreeBSD - Windows - MAC OS X

Krita

Krita is a creative sketching and painting application based on Calligra technology. Whether you want to create art paintings, cartoons, concept art or textures, Krita supports most graphics tablets out of the box. (GPL)

Linux - FreeBSD

mtPaint

mtPaint is a painting program designed for creating icons and pixel-based artwork. (GPL)

Linux - FreeBSD - Windows

MyPaint

MyPaint is a fast and easy painting application. It lets you focus on the art instead of the program. (GPL)

Linux - FreeBSD

Pinta

Pinta is a drawing/editing program modeled after Paint.NET. It's goal is to provide a simplified alternative to GIMP for casual users. (MIT)

Linux - MAC OS X

Tux Paint

Tux Paint is a free, award-winning drawing program for children ages 3 to 12. (GPL)

Linux - FreeBSD - Windows - MAC OS X

6 applications