Exceptionless - Don't let your users walk away in frustration.
Whoisology - Connected database of whois records and whois history
RoRvsWild - All-in-one monitoring for Ruby on Rails applications. Track performances & errors for requests & background jobs.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
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.