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The Keynote app is a full presentation app that makes creating attractive presentations easy on the iPad. It can input Microsoft Powerpoint documents for editing on the iPad but may lose complex formatting when taken back to Office on Windows.
Those using Google Docs in the cloud can work with them using the Google Drive app on the iPad. It provides access to Google's cloud service and the word processor, spreadsheet, and presentation apps now integrated into the app. It is the most basic office suite on this list but is free.
This screenshot shows a spreadsheet being edited.
This app puts a pretty face on the Google Drive apps for those preferring a better touch interface. It only works with the Google Drive service and replaces the Google office apps in Google Drive. It is a much better way to work with Google Drive docs.