Jazzy
Soulful docs for Swift & Objective-C
...You need development tools to build the project you wish to document. Jazzy supports both Xcode and Swift Package Manager projects. Jazzy expects to be running on macOS. Run jazzy from your command line. Run jazzy -h for a list of additional options. Swift documentation is written in markdown and supports a number of special keywords. You can set options for your project’s documentation in a configuration file, .jazzy.yaml by default.