Forza 6 is not on PC -- that link is to Forza 6:Apex, which although it shares a similar name, is a different game based on some of Forza 6's assets. It was essentially a test for Turn 10 to get their engine up and running on PC.
You can add Kinect Sports Rivals to that list. (But I wouldn't call it a notable release.)
I think technically the original Zoo Tycoon did not come out on PC. Just the Zoo Tycoon: Ultimate Animal collection (which appears to be a slightly different game)