Linux-based Sharepoint equivalents?

[Omer Zak]

A friend is learning about Sharepoint, and we chatted about this.
As a result, I am curious to know what, if any, Free Software package/s
can provide, more or less out of the box, functionality which is
equivalent to that of Sharepoint?

In other words, if a company asks for a Sharepoint solution, but without
the need to be compatible with any existing solutions, what Free
Software packages could we recommend them to use?

--- Omer


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