Microsoft Web Activities - Microsoft's new extension bringing timeline to Chrome
Whoisology - Connected database of whois records and whois history
Genie History Search - Always find the page you are looking for, like magic.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Ruin My Search History - Ruin your Google search history with a single click
JSON WHOIS API - Parsed domain WHOIS data from any WHOIS server via RESTful API with metered pay as you pricing.