Wikipedia
YaST
YaST ( Yet another Setup Tool) is a Linux operating system setup and configuration tool.
YaST is featured in the openSUSE Linux distribution, as well as SUSE's derived commercial distributions. It is also part of the defunct United Linux.
YaST features tools that can configure many aspects of the system.
The first SuSE distribution that included YaST was released in May 1996. YaST was re-written in 1999 and included first in SuSE Linux 6.3 as an installer-only. YaST2 was added to the desktop in SuSE Linux 6.4 and co-existed with YaST1 until YaST1's removal in SuSE Linux 8.0.