myNameserver: http://www.mynameserver.com offers free tools such as:
IP Tools
CIDR Converter
City From IP
Decimal-IP to IP
IP WHOIS Lookup
Ping
Reverse DNS lookup
Spam Database
Traceroute
DNS Tools
DNS Lookup
DNS Report
DNS Timing
ISP Cached DNS
Domain Tools
Abuse Lookup
Domain Valuation
Email Test
Free-Email Lookup
WHOIS Lookup Other Tools
HTML Validator
URL Analyzer
IP Tools
CIDR Converter
City From IP
Decimal-IP to IP
IP WHOIS Lookup
Ping
Reverse DNS lookup
Spam Database
Traceroute
DNS Tools
DNS Lookup
DNS Report
DNS Timing
ISP Cached DNS
Domain Tools
Abuse Lookup
Domain Valuation
Email Test
Free-Email Lookup
WHOIS Lookup Other Tools
HTML Validator
URL Analyzer