Online tools (DNS checkers, validators, etc.)

DNS

• What’s My DNS?
• DNS Lookup Utility
• intoDNS
• DNSstuff

Validators

• W3C Markup Validation Service
• W3C CSS Validation Service
• W3C Feed Validation Service
• W3C Web Accessibility initiative

Misc.

• Browser Shots – Browsershots makes screenshots of your web design in different operating systems and browsers.
• Sucuri Security Scanner – This scanner will alert you if it finds any Malware, spam, security issues on your website.
• Google Safe Browsing diagnostic – change ‘example.com’ in the address bar to the site you want to check.