iWork for Mac received the biggest improvements, with all new looks for Pages, Keynote and Numbers inspired by the look of OS X Yosemite. iWork for iOS received support for third-party storage providers, allowing users to save their documents with providers like Dropbox. Both versions of iWork received numerous improvements and refinements, like updated file formats for easier sharing through Gmail and Dropbox, customizable alignments and much more.
Apple's line of iWork apps are free to users who have recently purchased a new Mac or iOS device. Otherwise, each iWork app for Mac is available for $19.99 while each iWork app for iOS is available for $9.99.
Pages for Mac - [Mac App Store]
Keynote for Mac - [Mac App Store]
Numbers for Mac - [Mac App Store]
Pages for iOS - [App Store]
Keynote for iOS - [App Store]
Numbers for iOS - [App Store]