This tool allows you to work with various images at the same time, the use of layers and even procedural brushes, and a clone stamp to eliminate elements from an image.
As well as the latter, it adds the possibility to load/save the color palette, so that you can use customized palettes for specific projects. The undo/redo history allows you to go back and forward as much as you want, thus you will always be able to return an open project to its original conditions.
Pinta also includes advanced selection tools, that differentiate between different color tones, so as to be able to change a specific color, or to simply apply an effect to a specific part of the photo.
Therefore, if you're looking for an image editor that is in constant evolution, and that's free of charge, download and install Pinta.