Netronix make the hardware for both the CyBook and the eSlick. The CyBook is based on an old Netronix machine called the "EB100"; the eSlick is probably based on the "EB600" - you can see the specs of it for yourself on the Netronix web site.
In both cases, it's the licencee - Bookeen and Foxit respectively - who write (or license, in the case of things like the MobiPocket Reader) the "application software" for the machine.
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