rev 16 September 2011
LibreOffice- License: Open Source
- Description: Don’t want to pay $150+ for Microsoft Office? LibreOffice is a free, multi-platform office suite, recently forked from OpenOffice, and much improved.
Scribus- License: Open Source
- Description: Scribus is a desktop publishing program, similar in nature to Adobe InDesign, Microsoft Publisher, or Quark Xpress, but rather than being an expensive commercial program, it’s a multi-platform, open-source program available free of charge.
AbiWord- License: Open Source
- Description: AbiWord is a small, fast, standalone word processor for a variety of platforms. It’s not an integrated solution like OpenOffice, but gets the job done, depending on your needs
Gnumeric- License: Open Source
- Description: Gnumeric is a standalone spreadsheet application written for the Gnome desktop and ported to Windows. It is fast and accurate.
GanttProject- License: Open Source
- Description: This is customizable software that allows for easy creation of Gantt charts (scheduling charts, esp. for software writing).

you forgot to mention kOffice for *nix systems
But this is a list of Windows software. Maybe if KOffice gets a Win32 port in its KDE4 lifespan.
http://www.libreoffice.org/