The Apple Lisa was an advanced computer with a graphical operating system. However due to the high price and malfunctioning hardware sales were low. The Apple Lisa 2 was later fitted with the Macintosh operating system and sold as Macintosh XL but much of them ended up in a landfill.
From Apple Fritter, documentation about the Apple Lisa and its conception, including pictures.
Apple Lisa Computer
Homepage of an owner of the original Lisa. Contains links and tech information.
Apple Lisa The First Affordable GUI
Historical article about what the LIsa had to offer its users.
Apple Lisa Tribute
Articles, technical specifications, pictures and what happened to the Lisa.
Obsolete Computer Museum's Lisa page
Description and pictures.
Sigma Seven Systems Ltd.
An engineering and manufacturing company that specializes in Apple Macintosh technology. Still sells some Lisa accessories.