Inkscape is an open source drawing tool that uses the World Wide Web Consortium's (W3C) scalable vector graphics format (SVG). Some supported SVG features include basic shapes, paths, text, markers, clones, alpha blending, transforms, gradients, and grouping. In addition, Inkscape supports Creative Commons' metadata, node-editing, layers, complex path operations, text-on-path, text-in-shape, and SVG XML editing. It also imports several formats like EPS, PostScript, JPEG, PNG, BMP, and TIFF and exports PNG as well as multiple vector-based formats.

Requirements:
OS X 10.7+
X11/Xquartz

Also available are:
Version 0.48.5-2+X11 for OS X 10.6
Version 0.48.1-1 for OS X 10.5
Version 0.48.0-1 for OS X 10.4