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