Inkscape

A Free and open source vector graphics editor. It offers a rich set of features and is widely used for both artistic and technical illustrations such as cartoons, clip art, logos, typography, diagramming and flowcharting.

It uses vector graphics to allow for sharp printouts and renderings at unlimited resolution and is not bound to a fixed number of pixels like raster graphics. Inkscape uses the standardized SVG file format as its main format, which is supported by many other applications including web browsers.

Inkscape supports many advanced SVG features (markers, clones, alpha blending,
etc.) and great care is taken in designing a streamlined interface.
It is very easy to edit nodes, perform complex path operations, trace
bitmaps and much more.
We also aim to maintain a thriving user and developer community by using
open, community-oriented development.