Zabbix agent installation
I was disappointed too.
According to zabbix, it isn't in their plan to distribute a binary agent for Mac. That's a shame.
However, I found a post which describes how to do it yourself. Once compiled (once), you can deploy the agent executable to many machines...
I yet have to try.
http://bluepilltech.blogspot.lu/2015/02/how-to-compile-zabbix-agent-on-osx.html