Open Office
It is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. The user interface is very intuitive and very easy to learn, even for those who have used other similar commercial alternatives.
Learning to use Open Office
The following are visual guides with screen shots and step-by-step guides for getting things done in Open Office:
Basics of creating documents with OpenOffice.org Writer. Click here.
Basics of creating presentations with OpenOffice.org Impress. Click here.
Basics of creating and using spreadsheets with OpenOffice.org Calc. Click here.
Typing in Nepali and spellchecking support
UbuntuNepali page covers how to enable Nepali language support in Ubuntu as well as enabling spell checking.
Other learning resources
Official Open Office website : http://www.openoffice.org/