As part of QUADStor Systems effort to contribute to the open source community, we first developed a port for IET on FreeBSD. The first patch was posted to the iscsitarget devel list in january 2011 - http://sourceforge.net/mailarchive/message.php?msg_id=26850543
A few months after that IET on FreeBSD is made available from FreeBSD ports collection. More information can be got from http://cvsweb.freebsd.org/ports/net/iet
What Next
The original port was based on the 1.40.20.2 release of IET. Since then many fixes have gone into IET and features such as SPC 3 persistent reservations have been added. The next major release of IET is most likely going to be a 1.5 release before which we at QUADStor would try to bring the FreeBSD port in sync with mainline