What implementations of XPath 3.0 exist at present?

I am trying to get a more or less exact number of the currently
existing implementations of XPath 3.0.

The ones I am aware of are:

Saxon 9 (XSLT 3.0 and XQuery 3.0)

Mark Logic (XQuery 3.0, ??XSLT 3.0??)

BaseX  (XQuery 3.0, ??XSLT 3.0??)

Zorba ???

ExistDb ???

other ???

Which of these implementations are commercial and which have free
and/or open source versions? I know that BaseX is open source, what
about the rest of the existing XPath 3.0 implementations?

Could you, please, help in filling up this list -- I believe that such
information would be interesting and useful for all of us.



-- 
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
To achieve the impossible dream, try going to sleep.
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they
write all patents, too? :)
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.