Sometimes the free software eclipses the expensive stuff. Some of the ones
listed below, I have tried and some I have not. Use at your own discretion.
Here are some sources for free software...

 Better Browser than Internet Explorer: Firefox
  This is my favorite browser.

 Best HTML Editor Ever!!! HTML-Kit. I use this one daily!
http://www.chami.com/html-kit/

SEO software: Web CEO
http://www.webceo.com/index.htm

Anti-virus: AVG.  In my opinion, its the best I have ever used.  
http://free.grisoft.com/freeweb.php/doc/2/

 AntiVir http://free-av.com

Firewall: Zonealarm
http://www.zonelabs.com/store/content/company/products/znalm/freeDownload.jsp

Instant Site Maker
http://www.instant-sitemaker.com

 Green Eclipse Software (Time-Saving Tools & Games)
http://www.greeneclipsesoftware.com/products.html

.doc to PDF converter
http://convert.neevia.com/

Best SEO Tools
http://www.seocompany.ca/tool/seo-tools.html

Email Filter Checker
http://www.ezinecheck.com/check.html

Emotional Headline Analyzer
http://www.aminstitute.com/headline/index.htm

Press Release Creator
http://www.bmyers.com/public/539.cfm?sd=30

Signature Creator
http://www.vletter.com/design_visitor.htm

 http://www.mamboserver.com/ (Free CMS)
http://mamboforge.net/ (Free Components/Templates/Modules)
http://joomlaya.com/ (Free Components/Templates/Modules)
http://www.mambohut.com/ (Free Templates)
http://mambo-phpshop.net/ (Free Shopping Cart/Components/Modules)
http://www.mambojoe.com/ (Free Community Builder Components/Modules)
http://www.joomla.org/ (Free Components/Templates/Modules)
http://www.joomlaseo.net/ (Free Search Engine Optimization Components and Modules For Joomla CMS Sites)

 AdWizard Auction Ad Builder and a Closing Auction Timer(called BidBuddy - for sniping)
http://www.oldveterans.com/

 International Shopping Cart Software
http://www.oscommerce.com/  Great features in a free cart.

 http://www.jimworld.com/tools/keyword-analyzer/
http://www.googlerankings.com/

 This is a brilliant color picker tool. Better than any others and absolutely essential for any website owner.... Color Cop

http://www.datastic.com/tools/colorcop/