CodeWeavers released CrossOver XI software has been officially release for both Linux and Macintosh platforms, bringing initial support for Microsoft Office 2010. Based on Wine 1.4, CrossOver XI (version 11.0.0) is not only a major update to the popular application, but it also marks a step forward in its evolution, by simplifying the CrossOver product into a single one, uniting all CrossOver editions.
LibreOffice is a productivity suite that is compatible with other major office suites, and available on a variety of platforms. LibreOffice is a fork of the famous project OpenOffice project which is now under Oracle. It is free software and servers all your basic needs. It is the result of immense efforts by The Document Foundation aimed at making an Office suite or desktops that servers all your needs for free.
A group of key contributors to the OpenOffice.org (OOo) project have formed a new organization i.e. ‘The Document Foundation‘ to manage a community-driven fork of the popular open source office suite. Their goal is to liberate the project from Oracle’s control and create a more inclusive and participatory ecosystem around the software & save it from sudden-death just like Opensolaris project.
Download :-
[Update] LibreOffice 3.3.0 Release Candidate 4
The Open Office Suite in Ubuntu is just the perfect blend you need for all your Office needs.As Wiki says OpenOffice.org (OO.o or OOo), commonly known simply as OpenOffice, is an office application suite available for a number of different computer operating systems. It is written using the GTK and supports plugins like Firefox which provides it additional functionality.
Comparing with MS-Office or WordPerfect,this pack just fulfils all the needs of a Rookie like me 
that too for free.Now that’s something really satisfying since I don’t have to payout a hefty amount just for my small needs.Though online options too are available but they haven’t developed that much yet.
OOo has been divided into 6 components few of which are available by default in Ubuntu
Those six components are
Note : To install rest components you may use Applications >Add & Remove and search for “OpenOffice”
To Access OOo go to Applications>Office and select the desired component.We’ll take here the 3 basic components of it which are used most
Now lets take a quick look at these 3 components
Unlike Windows, when you install Ubuntu (& many other Linux distributions), a lot of Office and other Basic applications also get installed. You don’t have to spend time installing applications after you’ve installed the OS (that’s another reason why Linux is preferred for Live Distributions).
Here is some info about the applications which you’ll be using:
You’ll really be surprise to see that OpenOffice.org has almost everything inspite of being free which it’s counterpart Microsoft Office 2003 had. We’ll not compare the Microsoft Office 2007 with OpenOffice.org 3.0 because of a different interface.
Most OO.o applications can be accessed in the Application —> Office menu
GIMP can be accessed in the Application —> Graphics menu.
Brasero can be accessed in the Application —> Sound & Video menu.
Transmission can be accessed in the Application —> Internet menu.
But but but, we’ll highly recommend installing Deluge as we feel, it is better than Transmission and gives you a ‘uTorrent-ish’feel.
Deluge can be installed by the following command: sudo apt-get install deluge-torrent or alternatively from the Synaptic Application Manager.
Pidgin can be accessed in the Application —> Internet menu.
Ekiga can be accessed in the Application —> Internet menu.