homebrew - GitHub - new package manager for Unix software on OS X. A few interesting approaches, unlike Fink and MacPorts (I usually prefer the latter) it builds on already installed tools and libraries and therefore does not install half the internet if you only need a small tool. However, it currently has almost no support for dependencies, and the selection of packages is still quite narrow. And the result is really just self-compiled tools with a bit of link management around them.
Archive 2. February 2010
The Definitive Guide to Jython — Jython Book v0.91 documentation - it is what it says on the tin. Refers to Jython 2.5.1 and is also available as (updated with additional content, the open source version of the book is not yet fully updated) dead tree from APress.