After the Macintosh came out, it took them one year to write GEOS for the Commodore 64 to do some of the same things a $4000 Macintosh could do on a sub$500 Commodore 64 and 1541 drive.
It was the Commodore 64C that came bundled with GEOS.
They had a Commodore 128 version and a Commodore 16/Plus4 version of GEOS as well.
They also ported it to the Apple II series.