finger
directory of scripts and gateways
Carnegie Mellon University
finger and ping
GeezJan's command gateways
finger, whois, nslookup, traceroute, man
Patrick's command gateways
finger, nslookup, ping, whois, traceroute, host, cal, man
whoami
get a glimpse of what your browser sends to a remote server. includes documentation and source.
Whois Service Providers
InterNIC Web Interface
MilNet
RIPE