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!
Rasterbator - Wall art from any image
potrace - Open source program that transforms bitmaps into vector graphics.
Posteriza - Use POSTERIZA to design your own big posters and signs from any digital photo with your home...
RasterVect - Professional raster to vector conversion program (vectorizer).
Block Posters - A free poster maker to create massive wall posters from your own images! Free!