Also, iBooks supports ePub and PDF formats, so you can read more than just the books available from the iBook Store if you wish. It's integrated with the iBooks Store, so you can make purchases and downloads of the eBooks right in the app. Apple iBooksīundled with Mac Mavericks, the iBooks app, Apple's own e-book reading software is everything you need to get started with ebooks on the Mac. No matter what's your situation, here's the roundup of 3 best free apps for reading ebooks on your Mac OS X. Or you just find some eBooks at open libraries that can be read with a variety of free reading apps. Maybe the eBooks you collect are from a particular service like iBooks or Kindle that can only be opened with selected reading software. Apart from iBooks, the default eReader app on Mac, there are a lot of other cool and useful eBook reading apps you may not know. For whatever reasons you may want to read the eBooks on Mac OS X, choosing a great eBook reading app for your Mac in advance can always be important and necessary. Although it has already become a trend to read eBooks on smartphones, tablets or e-ink devices, there will still be a time when you need to open or read eBooks on your Mac.