Its not exactly true as Zentyal does ship binaries and I have no idea if they are just recompiled or are different from the originals and they are not on git hub or anywhere I know?
If I am wrong please correct me.
Also saying we are open source be cause our code is on github is slightly a null point when it comes to text web scripts which are always open by nature.
Also "Access to advanced documentation" is via a registration process and that is quite unusual for an OpenSource product.
Zentyal just configures some free opensource software and presents them as a whole in a web framework.
Zentyal's presentation and manner of operation is quite different from that source.
I guess opensource is a wide ranging term and if used loosely then Zentyal is open source.
I think there are many blurry lines with Zentyal that confuse opensource users so I can understand the point to some degree.
A product that is close is webmin.
Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage a system from the console or remotely
Its very blurry really as you can call it a "Zentyal Server" as 99% of the code is by others.
I guess it just makes it easy for the noob and non technical non linux person as a linux based ubuntu server comprising of a range of "Best of" open source enterprise applications under a singular web administration console is a little long winded.
I like the idea of the product but sometimes the marketing comes very close to crossing some lines.
Again I guess its all down to opinion.