After a bit of an interruption in service, the great
texdoc.net is back on-line. For those not familiar, it provides a web interface to the
texdoc command from TeX Live/MiKTeX. So you can type in (or link to) a package name and see the current docs: for example
http://texdoc.net/pkg/siunitx. The updated site now has TeX Live 2018: the current release of the major TeX system for Linux (which is what the system runs). Many thanks to Stefan Kottwitz for his continued work on this and DANTE for supporting the cost of running the site.