Vector Magic - Easily convert JPG, PNG, BMP, GIF bitmap images to SVG, EPS, PDF, AI, DXF vector images with real full-color tracing, online or using the desktop app!
Splashroad Separation Studio - Quick and Easy Color/Shape Separation
potrace - Open source program that transforms bitmaps into vector graphics.
Rasterbator - Wall art from any image
RasterVect - Professional raster to vector conversion program (vectorizer).
Posterizer - The rasterbator allows you to create posters larger than a standard page, using the tiled printing method. It will rasterize any image and output files that can be printed at home and reassemble to the original image.