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Pixelitor is a cross-platform raster graphics editor written in Java. It supports layers, layer masks, text layers, drawing, multiple undo, etc. It has more than 80 image filters and color adjustments, some of which are unique.
A panographic toolkit compliant with open source standards
pano3 (or "pano cube") is an experimental, cross-platform, open source toolkit designed to agree with modern web standards such as HTML5, CSS3 and CSS3D. The pano3 viewer is now released as a jQuery plug-in based on 3d transformations supported by CSS3D. The desktop utilities are written in Java 1.7.
A powerful C++ class library for image manipulation
ImageStone is a powerful C++ class library for image manipulation. Its features include load, save, display, transformation, and nearly 100 special image effects. It can be used cross platform (includes Windows, Linux, Mac), and especially under windows it can be used as a DIB wrapper class.
The goal of OpenPixel is to be an open source art program geared towards creating pixel art. It is written in Java and aims to be cross-platform and expandable via plug-ins.
Maru is a software for draw images based in grid. It can be applied to cross-stitch or games when it is necessary to draw images in squares. Some famous algorithms for drawing rects, polygons and circles are implemented. It is based in layers.