What are some alternatives?
TestFlight - iOS beta testing on the fly.
Shuttle.tools - Distribute and manage your mobile apps, all from one place. For Both iOS & Android.
The Beta Family - The Beta Family is a crowdsourcing platform for beta testing iOS and Android applications.
HockeyApp - Manage your betas and collect live crash reports for iOS, Android, Windows Phone, and OS X apps.
Diawi - Upload ipa or apk files to install them directly onto your phone
AppBlade - AppBlade provides essential tools for mobile app development.