OpenFruit builds unmodified Xcode projects into signed iOS apps natively on Windows, without a Mac.
The hardest part was Apple's own Swift macros, which only ship as macOS binaries. You can find more technical details here: https://ssilvestri15.github.io/openfruit-site/engineering.ht...
It's experimental and my first open-source project, built with a Claude Code, Codex and Gemini