Apple has released the second developer beta version of macOS 10.13.5 for testing. (9to5mac.com)
I've had a device enrolled in the Android developer beta version of Nougat since the program was announced. (pcmag.com)
The second developer beta version that Apple has released for iOS 10.2 is normally not accessible by regular users, as such versions are meant for developers to give them a head start in developing and tweaking their apps to work with an upcoming iOS update. (techtimes.com)