Download Go-OO!

Windows

Simply download the GoOo-en-US-version.exe file, and your native lang-pack, and install them one by one. We suggest to uninstall the older version before.

Universal Linux

Available are i586 and x86_64 packages. The URLs http://go-oo.mirrorbrain.org/stable/linux-i586/ and http://go-oo.mirrorbrain.org/stable/linux-x86_64/ are YUM repositories. You could add them as extra installation sources into your favourite package manager. The i586 repository can be simply added by installing this package. Alternatively, you might download the packages by this script. You need to set executive permissions or call it: python download-go-oo.py.

MAC OSX Intel

Simply download the main package, and your native lang-pack. Then install the main package, the usual way, e.g. drag the ooo icon inside the dmg to the Application folder. Finally, run the included lang pack installer, e.g. open .dmg, double click the icon inside, and answer the questions.

Source Code

Download: ooo-build-3.1.1.1
Browse: general overview, master branch, ooo-build-3-1-1 branch
To clone: $ git clone git://anongit.freedesktop.org/git/ooo-build/ooo-build (more info)
Announces: subscribe to the Go-OO announce mailing list

Other derivatives

openSUSE

Information, and Repositories: SLED10, SLED11 1-click install 10.3 1-click install , 11.0 1-click install 11.1 1-click install

Debian

Debian provides Go-OO in their repositories. To install it just type as root 
# apt-get install openoffice.org

Ubuntu

Ubuntu provides Go-OO in their repositories. To install it just type as root 
# apt-get install openoffice.org

Mandriva

Mandriva provides Go-OO in their repositories.

NeoOffice

NeoOffice - which provides openoffice for the Mac / OS/X is built on top of the Go-OO! version.

OxygenOffice

The OxygenOffice variant is built on top of Go-OO!. Available from sourceforge

DroplineGNOME

DroplineGNOME provide pre-builds packages for OpenOffice.org:

Frugalware

Frugalware provides OpenOffice.org in their repositories. To install it just type as root 
# pacman-g2 -S openoffice.org

Gentoo

Gentoo provides OpenOffice.org in their repositories. To build and install it just type as root 
# emerge openoffice

PLD

PLD provides OpenOffice.org in their repository. To install it just type as root: 
# poldek -uGv openoffice.org-APP
where APP can be one of base, calc, draw, writer

Unstable / development packages

Prior to new releases, we provide builds of the next Go-OO! on the web, but these are unstable, may be older, may break: in which case you get to keep both bits.
Windows, Universal Linux
SUSE: SLED10, SLED11 1-click install 10.3 1-click install, 11.0 1-click install 11.1 1-click install
To add a repository with zypper (NB. OO.o has been split into more individual packages here so make sure you get all of them): 
# zypper sa http://download.opensuse.org/repositories/OpenOffice.org:/UNSTABLE/openSUSE_10.2
# zypper --non-interactive in OpenOffice_org-gnome OpenOffice_org-writer OpenOffice_org-calc ...