Unidata has moved the large majority of its software documentation to this documentation portal. This project is still in progress, and we're still working on the visual appearance of the site, so please pardon the "Under Construction" appearance. (Also, the search field at the top right isn't working quite right yet, sorry! Searching within the individual documentation sets should work as you expect.)
Note: Documentation for packages marked with is available on GitHub rather than on Unidata servers.