OpenOffice原是Sun公司的一套商业级Office软件：StarOffice，经过Sun公司公开程序码之后，正式命名为OpenOffice发展计划，并由许许多多热心于自由软件的人士共同来维持。让大家能在MS OFFICE之外，还能有免费的Office可以使用。OpenOffice是个整合性的软件，里面包含了许许多多的工具，其功能绝对不比微软的MS Office还差，不但可以有Word一样的字处理，制作简单的图形，更有功能强大的图表功能，也能编写网页，还可以做出MS Office中很难处理的数学符号等等，支持了XML、微软的doc、Excel、ppt文件等格式。
OpenOffice.org 是一套跨平台的办公室软体套件，能在 Windows、Linux、MacOS X (X11)、和 Solaris 等作业系统上执行。它与各个主要的办公室软体套件相容。OpenOffice.org 是自由软体，任何人都可以免费下载、使用、及散布它。下列是 OpenOffice.org 的主要元件：
Writer (文书)
Impress (简报)
Calc (试算表)
Draw (绘图)
Math (公式)
Base (数据库管理)
OpenOffice.org is a multiplatform and multilingual office suite and an open-source project. Compatible with all other major office suites, the product is free to download, use, and distribute. OpenOffice.org is sponsored by Sun Microsystems, which is the primary contributor of code to the Project. Over 180,000 people from every nearly every curve of the globe have joined this Project with the idea of creating the best possible office suite that all can use. They do so under the auspices of "open source."
Features:
Writer – a word processor you can use for anything from writing a quick letter to producing an entire book.
Calc – a powerful spreadsheet with all the tools you need to calculate, analyse, and present your data in numerical reports or sizzling graphics.
Impress – the fastest, most powerful way to create effective multimedia presentations.
Draw – lets you produce everything from simple diagrams to dynamic 3D illustrations.
Base – lets you manipulate databases seamlessly. Create and modify tables, forms, queries, and reports, all from within OpenOffice.org
Math – lets you create mathematical equations with a graphic user interface or by directly typing your formulas into the equation editor.
This release builds upon the previous releases with multiple bugfixes and new features, such as the new chart options, report designer, accessibility improvements and translations.
Release Notes：http://development.openoffice.org/releases/2.4.0.html
便携版：http://portableapps.com/apps/office/openoffice_portable
官网：http://www.openoffice.org
v2.4.1 RC1 For Windows 官方下载：(简体、繁体以及其它语言都到位了，有有单独的语言包~)
http://ftp5.gwdg.de/pub/openoffice/extended/2.4.1rc1/
v3.0.0 Beta For Windows 官方下载：
http://openoffice.osuosl.org/developer/3.0.0beta/
v2.4.0 Final For Windows 官方下载：
http://ftp.ntua.gr/pub/OpenOffice/stable/2.4.0/OOo_2.4.0_Win32Intel_install_en-US.exe
v2.4.0 Final For Linux 官方下载：
http://ftp.ntua.gr/pub/OpenOffice/stable/2.4.0/OOo_2.4.0_LinuxIntel_install_en-US.tar.gz
其它平台参见：
http://ftp.ntua.gr/pub/OpenOffice/stable/2.4.0/
http://download.openoffice.org/index.html
http://zh.openoffice.org/downloads_gb.html