Geos was developed in 1985 by the Berkeley-University spinoff Berkeley Softworks. It gave a second live to the C64 by giving it an operating system to could compete with far more expensive computer. It was 'inspired' by the first MacOS and until Windows 3.x better that all Microsoft could offer. It tried to conquer the PC a few years later, but it was too late.
A complete set of office tools was developed, like a DTP application (GeoPublish) and Spreadsheet (GeoCalc). It was such a succes that even versions for the Mac were created. The rights are now in the hands of ZXVCV and the programme can be downloaded there. Power 64 has a printer driver which allows Geos documents to be printed on your Mac