Apple has announced that developers can now invite others to test out early Mac apps before they are released using TestFlight. This marks the end of the beta testing that began in August.
Developers of Mac apps can invite up 10,000 external testers via email or a link to the public. There are also tools that allow you to create multiple groups of testers and configure build access for each.
TestFlight is available in beta for several months. Developers can use the app to test both their own apps as well as apps from other developers. Developers can now send TestFlight betas out to the general public with the official launch. Download the TestFlight App from the Mac App Store to test apps. [Direct Link]