TestFlight 3.5.1 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free app can be installed on Mac OS X 10.7 or later.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of this free software for Mac is Colmeo AB. The most popular version of the program is 1.0. The application lies within Developer Tools, more precisely Distribution.
From the developer:
Testflight app contains free samples showing features of the MediaGuru App Publisher platform. And if you register a MediaGuru license at www.colmeo.se, you can build your own apps in MediaGuru and review them immediately using this app on the iPhone or the iPad.
You may want to check out more software for Mac, such as StatusBuddy, which might be related to TestFlight.