Inkscape. Draw Freely.
Version 0.47
gallery/thumbs/inkscape-0.47-tweakaroo_thumb.png
Several new modes in the Tweak tool - Move, Move In/Out, Move Jitter, Scale, Rotate, and Duplicate/Delete - make it possible to easily and naturally manipulate any number of separate objects, such as a tiling of clones. With a few soft brush strokes, you can turn a regular tiling into a freeform cloud, "power field," or even a complete drawing as in this example.

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