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/