OpenOffice is an open source office suite like Microsoft Office. It is comparable to Google Docs in this regard, though it will be storing things locally rather than the cloud. It has a spreadsheet (calc), word processor (writer) and several other office productivity applications. After LibreOffice split off, OpenOffice got left in the dust for a bit before its own devs got their act together. They are both extremely solid applications at this point.
AbiWord is another open source program, but is only a word processor. I have never used it personally, but some prefer it.
I haven't used any of the others, and compared to OpenOffice, I would have to be convinced that any of them could hold a candle, personally.