http://en.wikipedia.org/wiki/GIMP
GIMP (GNU Image Manipulation Program) is an image retouching and editing tool[5] and is released under the LGPLv3 and later versions and the GPLv3 and later versions as free and open-source software. There are versions tailored for most operating systems including Linux, OS X, and Microsoft Windows.
GIMP has tools used for image retouching and editing, free-form drawing, resizing, cropping, photo-montages, converting between different image formats, and more specialized tasks. Animated images such as GIF and MPEG files can be created using an animation plugin.
The developers and maintainers of GIMP strive to create a high-end free software graphics application for the editing and creation of original images, photos, icons, graphical elements of web pages, and art for user interface elements.
Sponsoring symmetric painting mode2013-09-23
Jehan Pagès, one of our active contributors, started a personal crowdfunding campaign to sponsor his work on symmetric painting in GIMP. You can find more information in his blog, and there's a video of a proof-of-concept implementation on YouTube. If you care about GIMP as a tool for digital painting, supporting this project is likely to benefit your workflow.
While we are not ready for a full-fledged crowdfunding campaign for GIMP yet, we think that this kind of focused campaigns, tailored for particular audiences, definitely have merit.