Bem, não sei até que ponto isto pode interessar a alguns users aqui do forum, mas o Xara Extreme já funciona em Linux, e parece ser uma alternativa Open Source interessante...

Xara Xtreme is the world's fastest and, we believe, most versatile graphics software. It is primarily a vector graphics program, but is one of the new generation of cross-over products that handles photos and drawings with equal ease. Xara Xtreme is also renowned for its slick, easy-to-use and easy-to-learn approach.

Xara Xtreme remains the most powerful (in terms of performance) and the most productive product available - these are objective measures and not just marketing spiel. Xara pioneered many of the graphic technologies that have become industry standard, from the first vector anti-aliasing, to the first vector transparency, including graduated transparency. The latest versions continue to innovate with dozens of industry firsts such as real-time vector feathering, embedded JPEG, the world's most efficient file storage, and unrivalled performance.


http://www.xaraxtreme.org/images/screenshots/viper.jpg

http://www.xaraxtreme.org