It is the next evolution of the world’s leading free office suite. The program is a successor to OpenOffice.org, and it has a rich feature set, strong support for open standards, and a free, open-source office suite compatible with Microsoft Office
LibreOffice is a private, free and open source office suite – the successor project to OpenOffice. It's compatible with Microsoft Office/365 files (.doc, .docx, .xls, .xlsx, .ppt, .pptx) and is backed by a non-profit organisation.