OpenOffice or open office may refer to:
Computing Software Apache OpenOffice (AOO), a derivative of OpenOffice.org by the Apache Software Foundation, with contribution from IBM Lotus Symphony OpenOffice.org (OOo), a discontinued open-source office software suite, originally based on StarOffice
Programming OpenOffice Basic (formerly known as StarOffice Basic or StarBasic or OOoBasic), a dialect of the programming language BASIC
File formats OpenDocument format (ODF), also known as Open Document Format for Office Applications, a widely supported standard XML-based file format originating from OOo OpenOffice.org XML, a file format used by early versions of OpenOffice.org Office Open XML (OOXML), a competing file format from Microsoft
See also Open plan, a floor plan Open Document Architecture (ODA), document interchange format (CCITT T.411-T.424, equivalent to ISO 8613) OpenDoc, an abandoned multi-platform standard for compound documents, intended as an alternative to Microsoft's Object Linking and Embedding (OLE)