OpenOffice or open office may refer to:
Computing
Software
OpenOffice.org (OOo), a discontinued open-source office software suite, originally based on StarOffice
Apache OpenOffice (AOO), a derivative of OOo by the Apache Software Foundation, with contribution from IBM Lotus Symphony
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
Other uses
Open plan, a floor plan
Open Document Architecture (ODA), document interchange format (CCITT T.411-T.424, equivalent to ISO 8613)
OpenDoc...