New Found FREE Office Apps--Updated on 25th of Ocotober 2012

LibreOffice, http://www.libreoffice.org/download/

Kingsoft FREE Office, http://www.kingsoftstore.com/presentation-free.html

NeoOffice (for Mac only), http://www.neooffice.org/neojava/en/download.php#download 

Other FREE office apps, please check this post http://1979lavanda.blogspot.tw/2012/06/re-post-alternatives-to-microsoft.html

For more, please visit this website for the list, http://www.freebyte.com/office/#suites