GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
Free
Open Source
Mac OS X
Windows
Linux
BSD
Haiku
Xfce
AmigaOS
GIMP is a freely distributed program for such tasks as photo retouching, image composition and image authoring. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, and more.
Available also as portable app: http://portableapps.com/apps/graphics_pictures/gimp_portable
Advanced image editing, enhancement and analysis software. The program contains both most image enhancement features found in conventional image editors plus a number of advanced features not even available in professional photo suites.
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Paintastic allows you to make beautiful drawings, paintings, designs and greeting cards. With just a few strokes on your Android smartphone/tablet you can create...
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