Todd Sundsted has been doing some amazing work with his fork of LambdaMOO, Stunt. While I was trying to catch up on the MOO-Talk discussion list (which has been very busy as of late!) he announced Composed, a package manager he wrote and has been using for two years. Check it out!
He even has a call to action for people to package their MOO code for release. Imagine one ANSI package to rule them all.