OpenOffice.org is a stable open source equivalent to MS Office including a word processor (Writer), a spreadsheet (Calc), a database manager (Base), a presentation manager (Impress), a drawing program (Draw), and a formula editor for generating mathematical equations and formulas (Math). The user interface is similar to the MS Office suite.For more details, see http://www.openoffice.org/.

StarOffice, developed by Sun Microsystems, is similar to OpenOffice.org. It is available on multiple platforms like Linux, Windows and Solaris. It contains The same modules as the OpenOffice.org suite. However, it features many advanced functionalities not available with OpenOffice.org. For more details, see http://www.sun.com/software/star/staroffice/.

KOffice is a very powerful and fully integrated office suite designed for the KDE desktop and is shipped with the SuSE Linux distribution package. It comes with various modules, like word processing (KWord), spreadsheets (KSpread), presentations (Kpresenter),several image (Kexi) processing applications (Kivio, Karbon14, Krita), a database front-end and many other applications. For more details, see http://www.koffice.org/.

Writer is the stable word-processing and desktop publishing module of the OpenOffice.org and StarOffice, developed by Sun Microsystems. StarOffice features many advanced functions not available with OpenOffice.org. For more details, see http://www.openoffice.org/product/writer and http://www.http://www.sun.com/software/star/staroffice.

KWord is a stable frame-based word-processing module of the KOffice Suite. Its easy-to-use features help to create professional looking documents. It can also handle large amounts of texts. For more details, see http:///www.koffice.org/kword/.

Calc is the spreadsheet and data plotting module of the OpenOffice.org and StarOffice suites. It is intuitive and easy to learn and offers a comprehensive range of powerful features. For more details, see http://www.openoffice.org/product/calc.html and http://www.http://www.sun.com/software/star/staroffice.

KSpread is the spreadsheet module of the KOffice Suite. It is a scriptable spreadsheet program which provides both table-oriented sheets and support for complex mathematical formulas and statistics. For more details see http://www.koffice.org/kspread/.

Gnumeric is a spreadsheet solution for the GNOME desktop environment that can also read files created with other spreadsheets. It's built-in functions and tools are extremely accurate. For more details, see http://www.gnumeric.org.

Impress is the presentation module of the OpenOffice.org suite that can create multimedia presentations and allows the user to use 2D and 3D clip art, fontworks, special effects, animation, and drawing tools. For more details, see http://www.gnumeric.org.

KPresenter is the presentation module of the KOffice Suite. It the user to prepare complete sets of slides containing text and graphics in a variety of formats, and of course, you can embed all sorts of objects. For more details see http://www.koffice.org/kpresenter/.

See Calc.

Kst is the data plotting module for the KOffice suite. It allows for real-time data viewing and plotting with basic data analysis. For more details, see http://kst.kde.org/.

Gnuplot is a very powerful and portable command line controlled data plotting software. It is also available for MacOS and Windows platforms. Plots created by Gnuplot can be exported to various formats, such as PostScript, PDF, and SVG, allowing you to process these plots easily. For more details see http://www.gnuplot.info/index.html.

Grace is a 2D plotting tool for many platforms including Linux. It can create and edit plots with a graphical user interface. Grace supports an unlimited number of graphs per plot. For more details, see http://plasma-gate.weizmann.ac.il/Grace/

LabPlot is a plotting tool for creating and managing 2D or 3D data plots and was written for KDE. Graphs can be produced both from data and functions and one plot may include multiple graphs. It also offers various data analysis methods. For more details, see http://labplot.sourceforge.net/.

Base is the database module of the OpenOffice.org and StarOffice suites. It can be used to create "self-contained" database documents with all relevant data, table definitions, reports, and forms. For more details, see http://www.openoffice.org/product/base.html

Kexi is an integrated data management application. It can be used for creating databases, inserting data, performing queries, and processing data. Forms can be created to provide a custom interface to your data. For more details, see http://www.koffice.org/kexi/

Rekall is a database management tool that supports many database applications like MySQL,PostgreSQL and Xbase. Rekall can be used for many tasks such as reports, forms, queries and others. For more details, see http://www.thekompany.com/products/rekall/

GNOME-DB provides a unified data access architecture to GNOME. It is useful for any application that accesses persistent data. It consists of a data abstraction layer (Libgda), a database widget library and a database front-end (Mergeant). For more details, see http://www.gnome-db.org/

PostgreSQL is an object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, and user-defined types and functions. For more details, see http://www.postgresql.org/

KmyMoney is a personal financial manager for the KDE desktop. It enables users of open source operating systems to keep track of their personal finances by providing a broad array of financial features and tools. For more details, see http://kmymoney2.sourceforge.net

GnuCash is a software tool to control personal and business finances. It enables users to keep track of income and expenses and it is also used to manage bank accounts, and stock portfolios. For more details, see http://gnumeric,org

Planner is a project management tool for the GNOME desktop aiming to provide functionality similar to the project management tools used under Windows. Amongst its features are Gantt charting and different display types for tasks and resources. For more details see http://wwwimendio.com/projects/planner/.

Taskjuggler is a project management tool that enables the user to control projects using Gantt charting features. It can also be used to generate reports in different formats (XML, HTML or CSV). Taskjuggler can be controlled from the command line but also offers a graphical front-end. For more details see http://www.taskjuggler.net.

FreeMind allows users to visualize their thoughts by creating and editing a mind map. It can copy nodes or the style of nodes and paste texts from sources such as HTML, RTF, and mails. The mind maps can be exported into various formats, such as HTML and XML. For more details, see http://freemind.sourceforge.net/wiki/index.php/Main_Page.

VYM (View Your Mind) is a tool for creating and editing mind maps. VYM mind maps are created in XML which can be exported to HTML. For more details see insilmaril.de/vym.

Semantik (previously Kdissert) is a mindmapping-like tool for structuring ideas and concepts and was designed for the KDE desktop. Users can generate various outputs from the mind map, such as PDF files, text documents and HTML files. For more details see http://freehackers.org/~tnagy/kdissert/.