Pages, Numbers, Keynote, iMovie & Garageband for Mac & iOS are all free. https://fnd.io/#/us/search
Visit the above website, insert your particular country's App Store in the top left corner. Searching under the All tab shows iOS content first, Mac stuff is found under the Mac tab.
A particular use of fnd.io is that you can find out the cost of any paid apps you may already own, making it easier to recommend them to others.