Given an Arduino compatible microcontroller or Raspberry PI (experimental), JTAGenum scans pins[] for basic JTAG functionality and can be used to enumerate the Instruction Register for undocumented instructions. Props to JTAG scanner and Arduinull which came before JTAGenum and forwhich much of the code and logic is based on.

A utility that digs through DNS domain records to find things that aren't obvious, such as subdomains, hostnames with more than one kind of record associated with them, and IP address range calculation. It even Google scrapes to gather intelligence.