Graphics / Photo Editing
GIMP
Photo editing application that rivals Photoshop in features.
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Paint.NET
Graphics editor with a very nice interface.
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Inkscape
Vector graphics application.
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Archiving
PeaZip
Fantastic archiving utility to extract and pack archives of an extensive amount of formats. PeaZip also features password protecting archives, keyfile support, system integration, a lovely interface, and much more.
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