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
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Posteriza - Use POSTERIZA to design your own big posters and signs from any digital photo with your home...
Sketch - Professional digital design for Mac.
Block Posters - A free poster maker to create massive wall posters from your own images! Free!