There are some great free programs on the internet at present that it seems a shame that we don't have a thread that includes the best of the bunch.

These are my favourites ..........

Zone Alarm (firewall) some people have problems with this programme but I have always found it very efficient.
http://www.zonelabs.com/store/content/catalog/products/sku_list_za.jsp

AVG Anti-Virus System
http://www.grisoft.com/us/us_updt7.php

Mailwasher .... deals with spam e-mails before they are downloaded onto your computer.
http://www.mailwasher.net/

Isobuster .... helps you to access data fron CD'S and DVD'S that would otherwise be lost. It recovered precious files for me from a corrupt back-up CD.
http://www.smart-projects.net/isobuster/

Have you a favourite that you would like to add to the list ?