The latest version of Zabbix can be downloaded from Softpedia
Zabbix 2.2 Alpha 6, an enterprise-class open source distributed monitoring solution, released under the GPL (free of charge for both commercial and non-commercial use), is now out and ready for testing.The Zabbix monitoring solution has been separated into multiple branches and this latest issue is yet another testing one, featuring multiple changes and improvements.
The developers of Zabbix 2.2 Alpha 6 have added support or loadable modules for extending Zabbix agent checks, support for internal events, fine grained control for Housekeeper support, VMWare virtualization platforms support, and much more.
A complete list of changes can be found in the official changelog. Download Zabbix 2.2 Alpha 6 right now from Softpedia.
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.