Page Snooper
Allows you to view source code on any page, as seen by a raw stream grabber. Useful for IFRAMEs, ASXs or pages that disallow simple View Source techniques.
Advanced Online Internet Utilities
Website allows you to perform ping, traceroute, nslookup, domain check, email check, plus a variety of network tools. Fast responses.
Secure Password Generator
Helps to generate strong and impossible-to-remember passwords. Useful for one-time passwords such as PHP scripts. I usually use Password Length=10, Include Letters, Mixed Case and Numbers.