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Is a program that enlarges image resolutions with the least quality loss.

Terragen: Is a no cost program to create landscapes and scenes of real appearance, imitating photography.
CollageMaker: Is a graphical tool that allows you to create stunning collage of photos, original and amusing.
Inkscape: Is vector graphics editor program, with capabilities similar to the Freehand, Xara X, Illustrator or CorelDraw.
FastStone Image Viewer: Is a fast tool, stable and easy to use, to explore images. It also allows editing and converting from one format to another.
C.a.R.: (Compass and Ruler) is dynamic geometry program, which simulates the computer in the construction of figures using a ruler and a compass. The application is free, and the source code is available under the License GPL.