OpenOffice.org is both a product and an open-source project. Both have been in existence since October 13, 2000. OpenOffice.org 1.0, the product, was released on April 30, 2002.
The OpenOffice.org project is primarily sponsored by Sun Microsystems, which is the primary contributor of code to the Project. Our other major corporate contributors include Novell, RedHat, RedFlag CH2000, IBM, and Google. Additionally over 450,000 people from nearly every curve of the globe have joined this Project with the idea of creating the best possible office suite that all can use. This is the essence of an "open source." community!

It included :

Base - lets you manipulate databases seamlessly. Create and modify tables, forms, queries, and reports, all from within OpenOffice.org
Calc - a powerful spreadsheet with all the tools you need to calculate, analyse, and present your data in numerical reports or sizzling graphics.
Draw - lets you produce everything from simple diagrams to dynamic 3D illustrations.
Impress - the fastest, most powerful way to create effective multimedia presentations.
Math - lets you create mathematical equations with a graphic user interface or by directly typing your formulas into the equation editor.
Writer - a word processor you can use for anything from writing a quick letter to producing an entire book.

Official site - http://www.openoffice.org/

OxygenOffice Professional (OOOP, O2OP) is an enhanced version of free OpenOffice.org what is a multi-platform office productivity suite. OxygenOffice Professional contains more extras like templates, cliparts, samples, fonts and VBA support.

Official site - http://sourceforge.net/projects/ooop

There is no need for you to upgrade your hardware or purchase a new operating system to run SSuite Office software. SSuite Office software has been designed and built to run on ALL Windows operating systems that support the "WIN32 API" Architecture. ( That's All of Them - Including Vista and beyond )
SSuite Office software do not run on JVM ( Java Virtual Machine ) like other office suites e.g. OpenOffice, StarOffice, and many other's available on the internet. You will not get messages like these when installing SSuite Office software:

"Your version of Java is Old, you need to Update your current version of Java before installation."

or

"No Java installed, some features may not work properly".

SSuite Office software is written in native Windows code, which is the same code as Windows itself. It does not need to be interpreted by another operating system like Java to run. Thus, you get complete stability and faster speed when running our office software on your Windows system.

It included :

Personal Edition - The benefits of the SSuite Personal office suite, is its small size, the independence of any third party software necessary to run on, and it can operate on any Windows platform with a consistent graphical user interface. It also incorporates a PDF creator for true document format compatibility.

Advanced Edition - This office suite runs on all Windows platforms and all hardware systems. With its full 32-bit architecture and stability, it can improve your productivity and document format compatibility. It has a full set of communication utilities to allow you to contact everyone on your LAN network or through the internet.

Galaxy Class - This office suite runs on all Windows platforms and all hardware systems. With its full 32-bit architecture and stability, it can improve your productivity and document format compatibility. This office suite introduces some new innovative concepts in interface design and user-friendly application interaction. You get instant system access, top class application design and a cleaner desktop to name a few.
The graphical-user-interface has been made into a more iconic-toolbar, mouse centric type of interface. This increases user-interaction speed and user productivity. So... if you enjoy a more uncluttered desktop, cleaner looking application interfaces, and faster software interaction, then this office suite is for You!

EZInvoice Creator - This invoice application is based on the latest graphical-user-interface technology. There is no typing necessary, just point and click to create and/or print product or service invoices for your clients... quick and easy.

Invoice Master - This invoice application is based on the latest graphical-user-interface technology. There is no typing necessary, just point and click to create and/or print product or service invoices for your clients... quick and easy. It also includes a custom reports/invoice writer and creator. Is also handles TAX or VAT systems and mass client email. Add your own custom logo to your report/invoice prints.

Monobase - Create unlimited databases with unlimited tables, fields, and rows. Includes a custom report builder. Interface with ODBC compatible databases and create custom reports for them.

The Fifth Element - This office suite runs on all Windows platforms and all hardware systems. With its full 32-bit architecture and stability, it can improve your productivity and document format compatibility. This office suite introduces some new innovative concepts in interface design and user-friendly application interaction. You get instant system access, top class application design and a cleaner desktop to name a few.
The graphical-user-interface has been made into a more iconic-toolbar, mouse centric type of interface. This increases user-interaction speed and user productivity. So... if you enjoy a more uncluttered desktop, cleaner looking application interfaces, and faster software interaction, then this office suite is for You!

Official site - http://www.ssuitesoft.com/

AbiWord is a free word processing program similar to Microsoft® Word. It is suitable for a wide variety of word processing tasks.

Official Site - http://www.abisource.com/

IBM® Lotus® SmartSuite®, the award-winning office suite, features these applications: Lotus 1-2-3®, the spreadsheet that started it all; Word Pro®, the word processor for today's Internet centered-world; Lotus Organizer Release 5.04, the world's leading personal information manager; Freelance Graphics®, the presentation graphics package for everyday communication; and Approach®, the relational database your whole team can use. IBM Lotus 1-2-3 and IBM Lotus Organizer are also available as stand-alone products.

Official Price USD$ 313.00
Licensing - Only 1 machines per 1 license

Official site - http://www-01.ibm.com/software/lotus/products/smartsuite/

Microsoft Office is a popular set of interrelated desktop applications, servers and services. Microsoft Office is collectively referred to as an office suite, for the Microsoft Windows and Mac OS X operating systems. Office was introduced by Microsoft in 1989 on Mac OS, with a version for Windows in 1990. Initially a marketing term for a bundled set of applications, the first version of Office contained Microsoft Word, Microsoft Excel, and Microsoft PowerPoint. Additionally, a "Pro" version of Office included Microsoft Access and Schedule Plus. Over the years, Office applications have grown substantially closer with shared features such as a common spell checker, OLE data integration and Microsoft Visual Basic for Applications scripting language. Microsoft also positions Office as a development platform for line-of-business software under the Office Business Applications (OBA) brand.

	Home and Student	Standard	Small Business	Professional	Ultimate
Official Retail Price	USD$ 149.95	USD$ 399.95	USD$ 449.95	USD$ 499.95	USD$ 679.95
Official Upgrade Price	N/A	USD$ 239.95	USD$ 279.95	USD$ 329.95	USD$ 539.95
Word
PowerPoint
Excel
OneNote
Outlook
Access
Accounting Express
Publisher
Groove
InfoPath
Licensing	up to 3 machines	1 machine	1 machine	1 machine	1 machine

Official site - http://office.microsoft.com/en-us/default.aspx

StarOffice Software is a complete, feature-rich office productivity product that's available for a fraction of the cost of similar office suites. It includes powerful programs for word processing, spreadsheets, presentations, drawing, database, mail and calendar, and Web publishing. Its user interface is intuitive and easy to use. Plus, it's multi-platform: available on the Microsoft Windows, Macintosh OS X, and Linux platforms, as well as on the Solaris Operating Environment.

Writer (Word Processing) - Whether you need to snap out a quick memo or craft an in-depth report with a table of contents, diagrams, and indexes, StarOffice Writer makes it simple.
Calc (Spreadsheet) - The StarOffice Calc spreadsheet lets you calculate, analyze, and share your data quickly and easily.
Impress (Presentation) - StarOffice Impress is a full-featured presentation tool.
Draw (Graphics) - StarOffice Draw helps you bring your communications to life with easy-to-create organizational charts, network diagrams, floor plans and sketches, and lots more.
Base - StarOffice Base enables you to easily create "self-contained" database documents with all relevant data, table definitions, reports, and forms.
Enterprise Tools & Support - Enterprise users will benefit from fast bug fixes through patches, the best ODF support, digital signatures and XForms support.

Official Price USD$34.95 - download / USD$54.95 - packaged product
Licensing - Install on up to 5 machines per 1 license

Official site - http://www.sun.com/software/staroffice/index.jsp