is the pages app free?

Hi! I just bought myself a Macbook Pro and when i clicked on the App store button I came to this screen:

As you can see I downloaded three of the six apps. On this screen, it doesn't say anything about any prize, so I just assumed they were free apps. However, when I clicked on some of the apps to read about them, I saw in a small info section that the apps did in fact cost around $15... But later I found them in the FREE SECTION of app store. So what's the deal!?!? Is it free or not? If it's not free, I want my money back...

best regards,