This is an installation-specific listing. Running raco docs (or Racket Documentation on Windows or Mac OS X) may open a different page with local and user-specific documentation, including documentation for installed PLaneT packages.
Racket Language and Core Libraries
Other Languages in the Racket Environment
GUI and Graphics Libraries
Implementing HtDP Teachpacks, Libraries, and Customized Teaching Languages
Experimental Languages and Libraries
Legacy Languages and Libraries