OpenOffice.org
http://www.openoffice.org/

Star Suite
http://jp.sun.com/starsuite/

KOffice
http://www.koffice.org/

GNOME Office
http://www.gnome.org/gnome-office/

Just Arks
http://www.justsystem.co.jp/justarks/

Hancom Office
http://www.hancom.com/jp/

ThinkFree Office
http://www.thinkfree.co.jp/

Applixware Office
http://www.vistasource.com/page.php?id=86

一太郎
http://www.justsystem.co.jp/news/2003f/news/j05151.html