FWIW, the PC-BSD project (think "FreeBSD fine-tuned for the Desktop") has written various tools to help managing such things as FreeBSD jails easier -- see, for example, warden [0]). If you're looking to try it out but don't need/want the desktop/GUI, there's also TrueOS. It's basically FreeBSD plus all the cool management tools they've written but minus the desktop/GUI. [0]: http://wiki.pcbsd.org/index.php/Warden%C2…
Can Warden be install on FreeBSD (not PC-BSD flavor)? Wondering, it looks nice.