Good iOS development tools and repositories that worth to use and investigate:
Swift-NIO - Event-driven network application framework for high performance protocol servers & clients, non-blocking
Factory - A new approach to Container-Based Dependency Injection for Swift and SwiftUI.
Sourcery - Meta-programming for Swift, stop writing boilerplate code.
Danger - Stop saying "you forgot to …" in code review
Xcode's "Build With Timing Summary" feature - building time reports
Tuist Create, maintain, and interact with Xcode projects at scale