Sophisticated tools for creating top-quality digital art are now available free through a Web application. With Raven, users can create complex illustrations based on vector graphics, in which formulas are used to render images that can be scaled to any size without losing detail. The market for this technology, which grounds much of today’s professional digital graphics, has been dominated by Adobe Illustrator. Ironically, Raven’s sophistication is possible partly because the application was created in Flex, an open-source framework for Web applications that’s also built by Adobe.