Adaxa Suite and WikiSuite have some similarities. This page is to explain the differences and rationale of choices. You likely will be interested in the other alternatives to WikiSuite.
Adaxa Suite clearly has a suite approach, and a very large number of features (ERP, Telephony , Document Management, etc.)
Adaxa is clearly stronger than WikiSuite in ERP features. But Tiki in stronger is networking (Firewall, VPN, etc.), and Collaboration (Wiki engine).
Adaxa doesn't seem to offer a mail server, prefering to connect to an exiting mail server, as documented here
There is a Bare Metal Installation guide but no download link.
More info at: http://www.adaxa.com/