The Rakudo implementation has a few modules included you may want to use; please note that the implementation is not part of the Raku specification and thus might be subject to change without prior notice. The following is a list of them, along with links to their source code.
CompUnit::* modules and roles
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These modules are mostly used by distribution build tools, and are not intended to be used (at least until version 6.c) by the final user.
NativeCall modules
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NativeCallNative Calling Interface (docs)NativeCall::TypesUsed byNativeCallNativeCall::Compiler::GNUUsed byNativeCallNativeCall::Compiler::MSVCUsed byNativeCall
Other modules §
Pod::To::TextUsed by several external modules