Free Web Based Tools and Utilities

• Web Proxy Server  - Bypass filtering for the purpose of testing.
• CheckDNS.org - Check for DNS related issues for any domain
• MX Toolbox Diagnostics - Check for SMTP gateway issues for any domain.
• Email Security Test - Send a salvo of test messages including emails containing variations of the inert EICAR test virus to your mail server to test hardness.
• EICAR Test Virus - Download a harmless test virus to test your local anti virus software.
• Free Anti-Virus Software - Download the AVG Anti-virus Scanner. (CNET editors call it "rock-solid proetection")
• Free Anti-Malware/Spyware/Trojan Scanner - Download A-squared scanner.
• Free Office Suite Software - Sun offers a free office suite of software that competes with MS Office! It's called OpenOffice and it's awesome!
• Default Password List - Useful list of default passwords for everything under the sun.
• Text Encryption - Here is a simple javascript app to encrypt and decrypt text based data using strong encryption. 
• RSS to Javascript Converter - This converts an RSS feed into a javascript news window. I used it on the home page.
• Speed Test - DSL Reports Speed Test
• Speed Test 2 - Another bandwidth Speed Test option
• Free Web Submission - A free web submission service.