AndrOpen Office claims to be "the World's first port of OpenOffice for Android."
Within this ever improving app you'll find all of the usual OpenOffice components with variations on the names. Writer (word processor), Calc (a spreadsheet), Impress (presentation graphics), Draw (a drawing tool), Math (equation editor) and Base (database).
As with OpenOffice file support is huge. You can easily open, edit and export documents in Word, Excel, PowerPoint, OpenDocument, Photoshop and more.
Obviously OpenOffice was originally designed to be run on a desktop so there are a few difficulties using it on smaller portable devices. However, the developers have made adjustments to compensate for this and it's fairly easy to zoom, scroll and swipe.