gp writes "Back in 1986, Berkeley Softworks presented GEOS, the Graphical Environment Operating System for the Commodore 64 (screenshots). GEOS effectively turned the 8-bit Commodore 64 into something very similar to a Macintosh, but for an 8th of the price. In 2004, pushed hard by rivaling C64 open source alternatives such as the Contiki operating system and desktop environment and the LUnix *nix clone, the owners of GEOS have finally decided to release GEOS to the public. Hordes of Commodore 64 users are expected to download the system." Sadly, there's no mention of GEOS for the Apple 2 series of computers, which also enjoyed this fine precursor of GUIs to come.