Does FreeBSD support network virtualization like Crossbow?
There is an initiative to get OpenStack working in FreeBSD and this solution requires a software-defined networking (SDN) layer. Based on the FreeBSD Project page, the team at Semihalf.com are porting over Juniper's SDN sub-system.
GitHub Project. (as of 2020 no updates in 6 years)
For those who are not aware, Juniper has used a fork of FreeBSD for many years although I understand that they are a couple versions back.
Even more cool stuff is coming to FreeBSD :)