Items marked as being available from fgb's contrib can be downloaded with the command
　　contrib/install user/package
contrib itself can be installed with
　　/n/sources/contrib/fgb/root/rc/bin/contrib/install fgb/contrib

[http://www.cs.bell-labs.com/wiki/plan9/Contrib_index/]

知らんかった。いつの間に。