GNU Wget is a free utility for non-interactive download of files from the Web. It supports HTTP, HTTPS, and FTP protocols, as well as retrieval through HTTP proxies.
Whois is a service that provides basic information about a registered domain, such as domain owner contact information, domain availability status and the company with which the domain is registered (also called the Registrar). Whois also provides registration and expiration dates of a domain as well as the nameservers the domain is using. ICANN regulations require all domain Registrants to keep their contact details valid and up-to-date to help prevent fraud and identity theft.
reverse-dns DNS Lookup is an online free tool that help you to find out what is the host/domain name of an IP address.