Labs64 NetLicensing - Monetize your digital products and services
TestFlight - iOS beta testing on the fly.
Quick License Manager - Quick License Manager (QLM) is a license protection framework that creates professional and secure license keys to protect software against piracy.
TestFairy - Painless Beta Testing
LicenseSpring - Reliable and easy to use License-As-A-Service (LaaS) for for any software application
TestApp.io - A platform that helps both mobile app developers and owners to easily share their apps with everyone to get feedback before reaching publicly to Google and App stores.