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Apache OpenOffice (AOO) and LibreOffice (LO) both contain word processor, spreadsheet, presentation, drawing and database programs. Also included in each is an equation editor to creat math formulas with square roots, integrals, etc if needed for your documents.

The products are entirely free for personal and business use and can be installed on as many computers as desired at no cost. Updates and upgrades are free as well.

AOO and LO both use the same file formats. An open international standard called Open Document Format (ODF) maintained by the Organization for the Advancement of Structured Information Standards (OASIS). This means files can be shared between the programs and Microsoft Office programs can read them as well.