"Open source office is a phrase commonly used to describe open
source office productivity software. Open source office software
typically contains the same applications as proprietary office
software including word processing, spreadsheets, databases,
graphics and presentation software.
"Most open source office software can be run on a number of
operating systems and will store your files in an open standard
format. Open source office software may also read and write files
from other proprietary office software.
"Open source office productivity software is popular because it
supports for many file types and it is free to download or use
online, so when compared to costly proprietary office productivity
software it has advantages.
"Some of the more popular open source office productivity suites
include OpenOffice.org, LibreOffice, AbiWord, FreeMind, Gnumeric,
KOffice and Google Docs & Spreadsheets."