OpenOffice

OpenOffice.org is one the office software which can be used on the place of MSOffice, it has all the features that are included in MSoffice, the best part in OpenOffice is that its free, however there is PRO version too for which you need to pay but all office applications and addons which are required for a normal user are bundled in its Free version.

Substitute : MSoffice XP
Download Link : Here