Whoisology - Connected database of whois records and whois history
History Search - History Search remembers what's on all those websites you visit so you can find them again.
Bulk Whois API - Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, top notch support, and more.
You.com - You.com, the world's first open search engine platform that summarizes the web for users, with superior privacy choices, actionable results, extensible apps and personalization through preferred sources.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Podcast Search Engine - Find anything inside your favorite podcasts