Xcode
Xcode is an IDE provided by Apple, primarily for creating iOS and MacOS apps. In order to run apps on real devices, Xcode is required for signing iOS/macOS apps.
Tracking
Xcode requires an Apple ID to install, and sends telemetry to Apple during every local build and every launch[1][2].
Usage
Xcode is irreplaceable for signing iOS/macOS apps. A 2024 Stack Overflow developer survey found almost no developers want to start using Xcode[3].