HijackThis a tool for removing spyware and other unwanted programs.
Written by Merijn Bellekom

Spybot - Search & Destroy can detect and remove a multitude of adware files and modules from your computer. Spybot also can clean Web-usage tracks from your system.

System Security Suite a utility that allows you to remove Internet tracks and junk files
from your computer. You can also specify custom folder locations with file masks.

Igor Shpak

System Security Suite

SIW This program perform computer configuration analysis and diagnostics. It gives detailed information about your computer properties and settings, and much more.

Gabriel Topala

System Info for Windows

OpenOffice is both a fully-featured office suite compatible with leading office products.
For now only the English version for windows is offered at this site.

openoffice.org

Open Office