Whoisology - Connected database of whois records and whois history
LOT Network - Help eliminate the patent troll threat
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.
Triangle IP - An intuitive drag-and-drop tool to help you capture enterprise-wide innovation & manage your patent lifecycle using patent data analytics
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Patentswatch - Software for monitoring patent applications worldwide