In terms of features, NeoOffice (donations accepted) is huge, truly a viable alternative to Microsoft office. It includes all the basic components: Writer, the Word processing component; Calc, for spreadsheets; Impress, the presentation module; draw, for the creation of graphics and diagrams; and Base, the database component. The spreadsheet component has some sophisticated features like Advanced DataPilot technology, Natural language formulas, an Intelligent Sum Button and a comprehensive range of advanced spreadsheet functions.
What‘s the difference? As with the open-source website editors, it gets a little confusing. Both LibreOffice and NeoOffice run on the Mac and both are open-source. The interface of both look almost identical at first glance, and they both share largely the same features. So why the redundancy and which should you choose? Well, while LibreOffice runs on both Mac and Windows, NeoOffice is Mac only. It is a special branch or fork of OpenOffice that was developed to quash some of the bugs in the Mac version of OpenOffice. So I would say, if you‘re going to choose one, choose NeoOffice.