OpenOffice.org

OpenOffice.org is a free, open-source office suite that provides tools similar to those found in commercial software like Microsoft Office. It includes applications for word processing, creating spreadsheets, making presentations, managing databases, and writing mathematical formulas. Designed to be compatible across different operating systems, OpenOffice.org allows users to create, edit, and share documents easily. As it's open-source, its source code is freely available, enabling anyone to customize or improve the software. Overall, it offers a comprehensive, cost-effective alternative for personal and professional document management and productivity.