Whois

Whois - Get the registration details of a domain name.
Reverse IP Lookup - Get the IP address that a website originates from.
Host Services - Check the accessibility of services on a domain or IP address.

HTML Encrypt - HTML encryption that can be interpreted by browsers.
IP Ban Generator - Ban IPs from accessing a website using .htaccess.

Google Banned - Check if a domain name is showing up in its search results.
URL Redirect Checker - Check if an URL is a redirect and if it is search engine friendly.
Meta Tag Creator - Generate the keyword, description and other meta tags for a page.

QR Code Generator - Generate 2D barcodes.
Browser Details - View internet and PC details.
GUID Generator - Globally Unique Identifiers.
MD5 Text - Get the MD5 hash value of a piece of text.
Gravatars - View an email address's gravatar.