BlockParty - Real-time voice chat rooms from the creators of turntable.fm
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
Referrer Spam Remover - Remove spam bots from your Google Analytics data
ipapi - Web analytics with IP address lookup and location API
Moderate - Identify, mute, and block trolls in your Twitter feed
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database