YaST is described as 'The installation and configuration tool for openSUSE and the SUSE Linux Enterprise distributions' and is an app in the system & hardware category. There are three alternatives to YaST for Linux, openSUSE, Debian and Mandriva Linux. The best YaST alternative is Mageia Control Center, which is both free and Open Source. Other great apps like YaST are Zypper and Linux Live Kit.
MCC, or drakconf, is a system configuration tool forked from Mandriva by Mageia.
Mageia Control Center is the most popular Linux alternative to YaST.
Mageia Control Center is the most popular Open Source & free alternative to YaST.
Zypper is a command line package manager for openSUSE which makes use of libzypp. Zypper provides functions like repository access, dependency solving, package installation, etc.
Linux Live Kit is a set of shell scripts which allows you to create your own Live Linux from an already installed Linux distribution.
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Zypper is a package manager, yast is a configuration tool, obviously providing much more functionality upon setting things up in opensuse