ODF Supporting Applications

A number of applications support the OASIS Open Document Format for Office Applications 
Word processors : (.odt)

  IBM Workplace
  KWord
  NeoOffice Writer 
  OpenOffice.org Writer
  StarOffice Writer
  TextMaker
  Writely

Spreadsheet documents (.ods)

  IBM Workplace
  KPresenter
  NeoOffice Impress
  OpenOffice.org Impress 	
  StarOffice Impress

Presentation documents (.odp)
  KPresenter 
  OpenOffice.org Impress 2.0
  NeoOffice 1.2 Impress
  StarOffice 8 Impress
  602Office 2.0 
  IBM Workplace

Graphics documents (.odg)
  OpenOffice.org Draw
  NeoOffice 1.2 Draw
  StarOffice 8 Draw 
  602Office 2.0 Draw 

Conversion / Publishing Systems
 Docvert
A more detailed listing & comparison of ODF applications can be found at this wikipedia page.