OctoLinker turns language-specific module-loading statements like include, require or import into links. Depending on the language it will either redirect you to the referenced file or to an external website like a manual page or another service.
Works for JavaScript, Java, Ruby, Python, Go, Haskell, Rust and a few others
Many of us already know OctoLinker, Stefan. I don't think it needs more publicity here, especially if it's not strictly JS related (which would be off topic).