AndrOpen Office is "the world's first port of OpenOffice for Android".
The suite has all the usual OpenOffice components: Writer (word processor), Calc (a spreadsheet), Impress (presentation graphics), Draw (a drawing tool), Math (equation editor) and Base (database).
The program can open a wide range of formats: Word (DOC/ DOCX), Excel (XLS/ XLT/ XLSX/ XLTX), PowerPoint (PPT/ POT/ PPTX/ POTX), OpenDocument (ODT/ ODS/ ODP/ ODG/ ODF), Photoshop (PSD) and many others (RTF, CSV, SVG, EMF/ WMF, TIFF and more). Your documents can then be edited and exported in a range of formats, including PDF.
The original OpenOffice was built for desktops, of course, and unsurprisingly the interface is tricky to use on small screens. The developers are beginning to address that - version 1.4.3 adds support for scrolling with a swipe, and zooming in and out with a pinch, as well as increasing some icon sizes - but data entry is remains generally awkward and slow.
A quick glance at the official "Known Issues" page reveals some very fundamental problems, too. As we write these include "Missing New menu", "Not working right-click", "Cannot open documents from main storage", "Cannot start without SD card", "Cannot open URL link in PowerPoint", and many, many more.
Version 1.5.4b is a bug fix release.