Open Source Software (OSS)

Open source doesn't just mean access to the source code. The distribution terms of open-source software must comply with a list of criteria such as Free Redistribution. The license is not restrict any party from selling or giving away the software as a component of an aggregate software distribution containing programs from several different sources. The license does not require a royalty or other fee for such sale. In a simple word, it is totally free.

A detailed list of free open source software packages for Windows could be found at: opensourcewindows.org or wikipedia.org

Open Office
OpenOffice is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages. It can be downloaded and used completely free of charge for any purpose.

Download Open Office software Free at: http://download.openoffice.org/

Ubuntu
Ubuntu is an operating system built by a worldwide team of expert developers. It contains all the applications you need: a web browser, office suite, media apps, instant messaging and much more.

Ubuntu is an open-source alternative to Windows and Office.

Download Ubuntu software Free at: http://www.ubuntu.com/getubuntu/download