Mac-zfs is a project mainly written in C, based on the View license.
Continuing where Apple left off with ZFS.
If you store data, you probably want ZFS.
This project exists to keep ZFS available and functional on MacOS X.
The initial blog post about the birth of this project on github tells a story.
Downloads are available at this project's download page, or via the google group.
The getting started guide at the google code wiki will help you start making use of the package.
There's a google group and a google code site for talking about and reading about the project.
The bug tracker is waiting for you to tell us how to improve the project.