Libre Office is a freely available, fully-featured office productivity suite.
Its native file format is Open Document Format (ODF), an open standard format that is being adopted by governments worldwide as a required file format for publishing and accepting documents.
Libre Office can also open and save documents in many other formats, including those used by several versions of Microsoft Office.
Component :
Writer (word processor)
Calc (spreadsheet)
Impress (presentations)
Base (database)