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Animation/Cartoons

Pencil - a traditional 2D animation software

http://www.pencil-animation.org/ Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics.
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gimp

30 Professional Tutorials for Designers Using GIMP | Tutorial Lounge

Disclaimer: We get inspiration in all of our stuff whether that will design Articles (related images) or Roundups (all designing stuff, source files, language codes etc...) and we also give the link back from where we get the images, graphics, source files and language codes (we aren’t the magicians to recognize that he’s a real owner or he grab or steal it) because we are not the owner of these content(s). If anybody would like to use any images, graphics, source files and language codes or content which we are also using, his duty is to find the real owner of that images, graphics, source files and language codes to use it according to the license (terms and conditions) of that content. If anybody have desire to modification, edition, deletion and print or any kind of use in that stuff he should find the real owner. http://www.tutoriallounge.com/2009/12/30-professional-tutorials-for-designers-using-gimp/
http://www.gimp.wisdomplug.com/published/page/2/category/Drawing

Drawing Drawing Effects In Gimp | Gimp Tutorials Wisdom

This is a full portrait painting tutorial using GIMP. Following it step by step will hopefully teach you a fair bit about human anatomy and how to paint, mainly using GIMP's airbush and smudge tools.

40 Top GIMP Tutorials to Turn you Into a Professional – Beginner to Advanced

GIMP is a fine replacement for Adobe Photoshop, especially if you have limited financial resources. Its main purpose is to help with the image retouching and editing, freely available for several popular platforms. For those who have a passion or pure need of a free editing software, we strongly recommend GIMP, along with 40 of the best tutorials listed in this post, to get you started, learn more, practice and turn into a pro. http://www.pxleyes.com/blog/2011/09/40-top-gimp-tutorials-to-turn-you-into-a-professional-beginner-to-advanced/

Aviary.com's Phoenix

Experiment with our rich editing tools. http://aviary.com/tools/phoenix
http://www.avs4you.com/ Convert piles of images to all key formats at one go!

AVS4YOU® Best multimedia software on today's market.

60+ (more) Advanced Photoshop & GIMP Tutorials

http://www.dennisplucinik.com/blog/2008/02/08/60-more-advanced-photoshop-gimp-tutorials/ Before getting started, I want to give a shout out to Collis down at psdtuts.com . This guy is actively putting out top notch Photoshop tutorials and has been getting crushed with traffic recently from what I can tell. Anyways, excellent work!