GEOS mouse
The Amstrad CPC suffered from the same problem as the Commodore 64. Both computers was lunched before the era af Graphical User Interfaces, and therefore lacked a propper pointing device from the beginning.
To make the use of the Commodore more modern, GEOS was invented in an attempt to mimic the most common Graphical User Interfaces of the time (GEM and Finder). To make the interaction with GEOS like that of its counterparts a mouse had to be supplied with GEOS. This mouse although designed for the Commodore 64 can be connected to a Amstrad CPC and used with the operating system FutureOS, as drives for the GEOS mouse apparently already exists in FutureOS.
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GEOS for the Commodore 64