FreeBSD

Looks great, but also seems pretty new. Wonder how "battle tested" it is.

What are others using for jail management? Last time I checked, two months ago, seemed like Bastille was the way to go. Anyone using it?

Seems sylve does more than jails, but It think the jail part may be one of the most useful parts (just form looking at the list of what it does), but will give it a try to see exactly how it works.