InkScape is an Open Source vector graphics
editor, with capabilities similar to Illustrator and
CorelDraw using the W3C standard SVG file
format. Inkscape supports many advanced SVG
features (markers, clones, alpha blending, etc.)
and it has a streamlined interface, which makes it
very easy to edit nodes, perform complex path
operations, trace bitmaps and much more. There
is also an active user and developer community
by using open, community-oriented development.