ipinfo.io - Simple IP address information.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
Email Verifier - Email verifier app lets you verify email.
IPTools - The "IP Tools" is powerful and handy application for network analyzing.
Verimail - Clean up email-address lists of any size or use our powerful API for real-time verification.