Free Open source alternative to ZOPIM?

I am actualy testing a Chat solution called ZOPIM, it's nice but I cannot afford expenses for the moment.

I am looking for free alternative to Zopim.

It should have the same or even better functionality and should be customisable.
I should be able to use it to support potential customer and to answer via Chat the their questions etc...
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Possibly Mibew

Also see

I can't give you much more information than that.  The website is opening very slowly for me.

There seem to be other free ones around but this seems to be the only open source once I can find.

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