A utility for Linux that attaches to a running process and searches the memory field for strings supplied by the user. Once found, you can then change the string to a different value. This works much like the pokefinder utilities on the 8-bit computers.
Online app that converts file sizes into other units (i.e., megabytes into bytes, kilobytes into gigabytes).
A poster of every extant processor, socket, module, and jack in use by computers today. Comprehensive and impressive. You can even buy a print of it if you want.