It’s called HopTo and it is FREE (written in caps for emphasis). The IOS ecosystem is not known for it’s free apps but HopTo is and it’s great. You will be able to do most if not all you can using the Windows Office suite. Here is an excerpt from their website:
Access, find, edit and share your files and documents with hopTo. Create and edit Excel and Word documents and save them in cloud storage. Download photos to your iPad and search the web for images and insert them into documents. Finally full productivity comes to the iPad with an intuitive multi-tasking user interface.