Open source comes in .tardist extension files. They normally install automatically when you click on them in your browser.
All packages come with the full original documentation if it exists.
To make this work, you must tell the man program to search there. Or simply follow the instructions on the SGI Freeware web page which recommend running the utility fixpath . You should run fixpath only once to update your personal startup files. HTTP implementations seem to time out and fail on slow links and big files. You may safely ignore this message.