Why I use it: Apple IDE for iOS development with Interface Builder, simulator, and debugging tools
Why I use it: Automation tool for iOS and Android deployment including screenshots, signing, and releases
Why I use it: Dependency manager for Swift and Objective-C projects with thousands of libraries
Why I use it: Interactive Swift coding environment for learning and prototyping iOS apps
Why I use it: Apple beta testing platform for distributing iOS apps to testers before release