Below are some resources with serious mojo—resources that I make use of regularly and deem worthy of your attention.
[+] Ad-Aware 2007 Free
[+] EditPad Lite text editor
[+] FastStone Image Viewer
[+] FileZilla FTP client
[+] HTML-Kit HTML editor
[+] Mozilla Firefox Web browser
[+] Mozilla Thunderbird e-mail client
[+] OpenOffice.org
[+] Opera Web browser
[+] PDF reDirect
[+] TweakNow RegCleaner Standard
[+] WordWeb Dictionary and Thesaurus
[+] ZoneAlarm Personal Firewall
*NOTE: Some software is free only for non-commercial use. It's your responsibility to understand the software's licensing agreement and to actually learn how to use the product. I assume no responsibility for those who think they can fly simply by putting on a Superman costume.
Currently being updated
[+] Acronym Finder
[+] Answers.com
[+] Dictionary.com
[+] HyperDictionary.com
[+] TheFreeDictionary.com
[+] TinyURL.com
[+] Webopedia
[+] Whatis.com
[+] Wikipedia
[+] WordWeb Online
[+] A List Apart
[+] CSSBeauty
[+] CSSVault
[+] CSS Zen Garden
[+] Digital Web Magazine
[+] SitePoint
[+] Stylegala
[+] W3 Schools
[+] World Wide Web Consortium
Currently being updated