From OpenDocument Fellowship:
OpenDocument Viewer (ODF Viewer) is a cross-platform viewer for OpenDocument text (.odt), spreadsheet (.ods) and presentations (.odp) files. The package is entirely self-contained; everything it needs is included. It uses the Mozilla Application Framework. We chose this framework because it allows us to get a reasonable-quality viewer done in a very short time. Unfortunately, this also means that some features, like pagination and multiple-column layout, cannot be implemented.