While OpenOffice is still around, LibreOffice has more developers and is now the more popular project.

It's similar to the desktop versions of Microsoft Office, and it can even work with and create Office documents in common file types like DOCX documents, XLSX spreadsheets, and PPTX presentations. LibreOffice is a free and open-source office application for Windows, Mac, Linux, and other operating systems.There are completely free office suites that sport good compatibility with Microsoft Office documents, spreadsheets, and presentation files. If you're looking for something else, consider choosing a different office application.