On the PC side we have been using Flexera's AdminStudio for years for building packages. I got an email from them this morning saying that there 2016 version was out. Started reading it over and it would seem that they are now doing Mac package building as well. It also mentions that it works with Casper. Anyone heard about this ?
http://learn.flexerasoftware.com/AR-Contact-Us-AdminStudio-2016-Mac-Mobile
