Apache OpenOffice

Apache OpenOffice stands as one of open source's longest battles against proprietary software dominance, providing a complete office suite that has served over 390 million users since its roots in Sun Microsystems' StarOffice acquisition in 1999.

The suite delivers six integrated applications: Writer for word processing from quick letters to complete books, Calc for spreadsheet analysis with numerical reports and dynamic graphics, Impress for multimedia presentations, Draw for diagrams and 3D illustrations, Base for database management with forms and queries, and Math for mathematical equation editing.

Compatibility with Microsoft Office formats ensures seamless file exchange—OpenOffice reads and writes .docx, .xlsx, and .pptx files alongside its native OASIS OpenDocument Format (ISO/IEC 26300), the first software to adopt this international open standard. This eliminates format conversion headaches and lock-in to proprietary ecosystems.

Available in 41 languages and running on Windows, macOS, and Linux with consistent cross-platform functionality, OpenOffice provides genuine accessibility to global populations. The software requires no license fees, no activation codes, no subscription renewals—install on unlimited computers, distribute to employees, students, family, anyone, with zero restrictions.

Developed under the Apache License 2.0 with completely open development processes visible on GitHub, OpenOffice represents software freedom in its purest form. Anyone can view source code, contribute improvements, or fork the project for specialized needs. The transparent development model ensures no hidden surveillance, no forced updates, no planned obsolescence.

However, honesty demands acknowledging OpenOffice's challenges: development has slowed significantly with security vulnerabilities remaining unpatched for extended periods (Apache Foundation rates its security status as red" as of July 2025). The community struggles to maintain sufficient developer participation