MacPaw (makers of CleanMyMac 3, Encrypto, Listen for iOS, and more) has been developing a platform for Mac OS app development and distribution for a while. It started as an internal project for use with CleanMyMac, but is available today as DevMate, a tool for all Mac developers and vendors.
This is a companion discussion topic for the original entry at https://brettterpstra.com/2015/05/26/macpaw-announces-devmate-distribution-platform-for-mac-devs