What are some alternatives?
ClearBrain - Predict which users will upgrade or churn tomorrow.
Android Studio - Android development environment based on IntelliJ IDEA
ChurnKit - Find out who removed your service from their website.
PubNub - PubNub is a real-time messaging system for web and mobile apps that can handle API for all platforms and push messages to any device anywhere in the world in a fraction of a second without having to worry about proxies, firewalls or mobile drop-offs.
ProfitWell Retain from Price Intelligently - Delinquent churn reduction for Zuora, Braintree, and Stripe
Xcode - Xcode 4 is the new version of Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.