Abiword
AbiWord 2.4.6 is an award winning, small, fast, featureful and crossplatform word processor. It is suitable for a wide variety of word processing tasks. U/W

Gnumeric
The goal of Gnumeric is to be the best possible spreadsheet. We are not attempting to clone existing applications. However, Gnumeric can read files saved with other spreadsheets and we offer a customizable feel that attempts to minimize the costs of transition. U/W

Dia
Dia is roughly inspired by the commercial Windows program 'Visio', though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams.

OpenOffice.org (Linux, Solaris, Windows)
OpenOffice.org español (Linux, Solaris, Windows)
OpenOffice.org Project FreeBSD
OOo42.org german
Die OpenOffice.org PrOOo-Box german
The office package for Unix and Windows. U/W
Writer (word processor), Calc (spreadsheet), Impress (presentation program), Base (creating and manage databases) Impress (presentation program) and Draw (drawing and Image manipulation). This including as tools flowcharting and work with vector graphics and photo (pixel) image. In syntax of Microsoft Office this are Word, Excel, PowerPoint, Access and Publisher.

OO Extras
Extras for OpenOffice.org. U/W

Lotus Symphony
Be Free. Work Smart. Office productivity software that is intuitive, easy to use. This office suite is based on OpenOffice.org and is like one small versión of OpenOffice. This site have many usefull things, for OpenOffice too.

KOffice - the office for UNIX

KOffice
The KOffice suite includes the following applications for UNIX systems: U

Tools - for the office

PDFreaders
There are many programs to read and write PDF documents. The list of PDF readers is vendor neutral and all of them are free software.
Xpdf
The PDF Viewer for X-Windows y Windows. U, tools for W
SumatraPDF
Sumatra PDF is a slim, free, open-source PDF viewer for Windows. Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features. It's small and starts up very fast and designed for portable use. W
PDFCreator
PDFCreator is a free tool to create PDF files from nearly any Windows application.

Gobby
Gobby is a free collaborative editor supporting multiple documents in one session and a multi-user chat.

OpenGoo
OpenGoo is an Open Source Web Office. It is a complete solution for every organization to create, collaborate, share and publish all its internal and external documents. U/W

CommuniGate Pro
Your FREE 5 user license of CommuniGate Pro for Unified Communications: Single address, single identity for all Internet Communications Pronto! an Adobe Flash client with blazingly fast Internet Communications features Email through standards-based clients like Thunderbird or Apple Mail Email and Collaboration through Outlook in Work-group mode Groupware features like Calendaring, shared address book and shared folders. Click-to-call VoIP from Outlook or Pronto! Secure Instant Messaging with clients using SIP/Simple or XMPP (Jabber). Platform Choice (Unix, OSX, Windows, Linux, BSD, and more)

eyeOS
eyeOS is a new kind of Operating System, where everything resides on a web browser. With eyeOS, you will have your desktop, applications and files always with you. Just open a web browser, connect to your eyeOS System and access your personal desktop. U/W

O3Spaces community
O3Spaces Workplace brings document management and document collaboration features to OpenOffice.org & StarOffice, including real-time version control, check-in/check-out and document security. O3Spaces Workplace is the integrated Basic Content Service for OpenOffice.org & Staroffice. U/W

OpenProj
The OpenProj solution is ideal for desktop project management. OpenProj is a complete desktop replacement of Microsoft Project and even opens existing native Project files. The OpenProj solution has Gantt Charts, Network Diagrams (PERT Charts), WBS and RBS charts. U/W (Java)
GanttProject
Tool for creating a project schedule by means of Gantt chart and resource load chart. Compatible with Microsoft Project. U/W (Java)

Aspell
GNU Aspell is a Free and Open Source spell checker designed to eventually replace Ispell. It can either be used as a library or as an independent spell checker.