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It's a Microsoft Office world, and sometimes you can't escape the need to work with Office documents. This app lets you do so using full Office programs, and free. The latest version has added full PDF support to complement the Word, Excel, and Powerpoint apps included.
CloudOn works seamlessly with DropBox and Box accounts for easy access to documents stored in the cloud. You can also easily share documents with contacts via email in the latest version. There is an amazing amount of utility included in this app, and the price couldn't be better.