Xara Xtreme for Linux (formerly known as Xaralx) is an open source image editor based on the Windows Xara LX (which is also an image editor, obviously).
A few days ago I was telling you about sK1, an open-source vector graphics editor similar to CorelDRAW or Adobe Illustrator but at the time I wrote that post, there weren't any pre-build packages for the latest version and also there were some errors compiling it in Ubuntu 9.04.
You can face the task sometimes that you need a high resolution material from a particular image. Most probably when you’re a graphic designer (or even a tattoo artist), you might want to have a good quality result from a low resolution image that you can magnify no matter how much, it will give you smooth edges in high quality.
I know you’re looking at it. I know because I can track links through Wordpress, and two hours after I posted that last screenshot, I had double-digit clickthroughs. It is a rather interesting image, don’t you think?
Inkscape is an open source vector graphics editor, similar to Illustrator or Xara. It uses the W3C standard Scalable Vector Graphics (SVG) file format. It's capable of creating objects with a variety of drawing, shape and text tools. You can edit previously created objects with scale, gradients, masks, and filtered effects.