Perl

"The duct tape of the Internet"

• Perl Digger
• URLToys

• Device::GSM - an AT Commands wrapper, damn useful for automated testing.
• URI::Fetch
• Perl Monks
• Perl Wrapper (an Xcode project that allows you to package Perl code as standalone Mac OS X applications)
• Periodic Table of Operators

• Acme::Bleach (plus a cast of thousands)

• Perl Linux - everything but the kernel, written in Perl...