Qato is completely separate from StackExchangeStack Exchange. It's produced by DZone, who also manage the free open-source StackExchangeStack Exchange-like [OSQA][1]OSQA software.
There's no business connection, to my knowledge. Some sites that did run on the StackExchangeStack Exchange 1.0 software did migrate over to OSQA when their time on StackExchangeStack Exchange ran out.
Other background: Qato is written in Java. OSQA is written in Python &and Django.
(I've no business connection with DZone. I do host a couple of private OSQA sites.) [1]: http://osqa.net