A free app for iPhone, by Kingsoft Office Software, Inc..
WPS Office is an all-in-one free office suite on iPhone and iPad that integrates all office word processor functions: Word, PDF, Presentation, Spreadsheet, Memo, and Docs Scanner. With this, you can easily create, view, edit, and share word documents and spreadsheets.
The app allows you to edit your documents and word documents using a variety of tools including pencil, highlighter, eraser, and text. You can add comments to your document and also insert images, shapes, and even PDFs.
You can also create presentations, which you can view on the go using the built-in viewer. You can also use the app to create PDFs and present them.
The app is compatible with Microsoft Word, Excel, PowerPoint, Google Doc, and Adobe PDF format.