Inkscape is a wonderful vector drawing software, perfect for illustration, cartography, typographic drawing, logos, posters…
Inkscape is an open-source vector graphics editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X. What sets Inkscape apart is its use of Scalable Vector Graphics (SVG), an open XML-based W3C standard, as the native format.
Inkscape offers a set of precise tools such as its pen tool and an advanced caligraphy tool. It also comes with a lot of interesting features to experiment and hack: addons (extentions), scripts, filter editor, and all kind of generators.
The development of Inkscape is also active and the comunity is huge: (tutorials, wikis, video demo). That makes this software a really complete tool for all kind of creators.