The Apache OpenOffice package actually includes six programs that all use the same engine making them inherently the same and extremely easy to learn and use. The 6 applications included in the Apache OpenOffice suite are: Writer (word processor), Calc (spreadsheets), Impress (presentations), Draw (diagrams and illustrations) and Base (database manipulation) and Math (mathematical equations). Writer can even natively do some things that Word cannot, like open PDF files without the addition of a plug-in or commercial add-on. As the software is open source it is maintained by a large community meaning help and bug fixes are freely available and quickly created. The downside to Writer is that it can only open DOCX files without the ability to edit and save them. You can install this suite on Windows XP to Windows 10, macOS and Linux.