Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
HyperTrack - Build logistics apps that feel like the future
UptimeRobot - Free Website Uptime Monitoring
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
Pingbreak - Pingbreak is an original and free monitoring service.
LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address