LibreOffice

Work with text documents, spreadsheets, presentations, mathematical formulas, databases and images. It supports more than 90 formats (including DOC, DOCX, XLS, TXT, PPT, DOT, HTML) and includes the following components: Writer (a text editor with the HTML visual editing function), Calc (a table editor), Impress (a presentation maker), Draw (a vector graphics editor), Math (a mathematical formula editor), Base (a database management system).