What is munki?
munki is a set of tools that, used together with a webserver-based repository of packages and package metadata, can be used by OS X administrators to manage software installs (and in many cases removals) on OS X client machines.
Comments and Reviews
Said about munki as an alternative
Munki is cheaper than JAMF Casper Suite, and provides if anything an app store experience close to the Apple Mac store model, plus is easier to develop and release packages. It is not as good at admin type tasks.
Pretty robust when combined with MunkiAdminReport and MunkiReport-PHP