z/OS – a proprietary 64-bit server operating system developed by IBM for its mainframes. It is a further development of the OS/360 operating system, integrating MVS and Unix system services... #operatingsystem #ibm #dos
Katz – a free VoIP instant messenger created in 2015 by the Aero2 network. It allowed for free calls and messages between app users, as well as paid calls to landlines and mobile numbers via the Katz OUT service. #messenger #voip #windows #android
