Desktop version - Universal Installer
For most users of Open ZFS. Share memory with kernel and follow Apple's memory API requirements.
OpenZFS on OS X 1.2.0-2.dmg 2014/03/13
Server version - Universal Installer
For those with dedicated hardware to Open ZFS, and wish to go over the 1/8th memory limit in the kernel.
Download links go here.
Development build DMGs
Helping with development? Tracking down a bug, these are the latest builds
Building Open ZFS from Sources
Include ZeroBSD guide here?