电子羊: electricsheep.org
ImageMagick: www.imagemagick.org
Marcel 的葡萄酒页面: www.marcelgagne.com/nfwine.html
netpbm 工具: sourceforge.net/projects/netpbm
xmountains 网站: www.epcc.ed.ac.uk/~spb/xmountains