Fantastic People LibreOffice is about more than software. It’s about people, culture, creation, sharing and collaboration. Join us today! Your private, free office suite 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.