According to Phoronix.net, USB-based DisplayLink graphics adapters are now supported in FreeBSD, thanks to the developers.
The FreeBSD kernel finally has support for USB-based DisplayLink graphics adapters.
Within the Linux world there’s been DisplayLink work going back to 2009 with frame-buffer and X.Org drivers and by 2012 had advanced to having a DisplayLink DRM/KMS driver. DisplayLink USB 2.0 devices continue to work quite well under Linux and these USB display chips can be found in a wide variety of products.
As of last week, the FreeBSD kernel has USB DisplayLink support in the form of a frame-buffer (FB) and virtual terminal (VT) drivers. The initial FreeBSD DisplayLink support was pushed via this SVN commit.
For those looking for Linux (and assuming BSD too) friendly DisplayLink hardware, I’d recommend checking out the Plugable selection with having used some of them myself. You can find the Plugable USB display product selection at Amazon.com.