What is Apache OpenOffice? Apache OpenOffice (AOO) is free and open source software for office productivity owned by the Apache Software Foundation (ASF).

Challenging LibreOffice’s spanking new version 4.1, Apache OpenOffice 4.0 boasts a splashy in-document user interface, hundreds of bug fixes, and many more features big and small.

Lagging slightly behind Microsoft Office in features, Apache OpenOffice has a lot of functionality and flexibility, as well as tight integration among components. It's also free and open-source.