SwiftGen is a mature, production-grade Swift code generation tool that produces type-safe Swift (and Objective-C) code from project resource files. It parses asset catalogs, strings files, fonts, storyboards, JSON, YAML, plist, Core Data models, colors, and arbitrary files, then feeds the parsed context into Stencil templates to generate compile-time safe accessors. The tool is primarily a CLI executable (`swiftgen`) that can be integrated into Xcode build phases, but it also exposes a reusable framework (`SwiftGenKit`) for parsing and context generation. The architecture cleanly separates parsing (SwiftGenKit) from template rendering (Stencil) and CLI orchestration (SwiftGenCLI), with a YAML configuration file (`swiftgen.yml`) centralizing all inputs, outputs, and parameters. The codebase is well-tested with unit tests for each parser and template output comparison against extensive fixture files. It supports Swift 4 and 5 output variants, custom templates, and parameters like `publicAccess`, `bundle`, and `lookupFunction`. While the project has some deprecated features and a large fixture set, it is actively maintained with recent commits, a clear migration guide, and a robust release pipeline via GitHub Actions.