I have compiled a FreeBSD_amd64 package:
http://mango.euba.sk/zimbra/zcs-inst...D_amd64.tar.gz

Please, follow the included README.FIRST. If you find any bugs, please let me know, it's crucial to know if everything works as intended. There might be an issue with included sasl-plugins, if that's the case (postfix smtpd not starting), please let me know so that we can fix it once and for all.
This is a linux-like release compiled and altered for FreeBSD so be prepared for some compromise.

I am currently working at fully porting zcs to FreeBSD so that anyone is able to build directly from ports. One big mega-port as was suggested. That's a lot of scripts to remake so, please, be patient.