IP-to-Country
    — This page will tell you what country you're in base on your IP, as well as letting you put in any other IP to see its location.

K-Map Creator
    — Generates K-Maps for 2-6 literal systems.

Host Name / IP Resolver
    — I can't remember how many times I've needed to resolve an IP into a host name or vice versa. This page makes it easy.