Distill - Tracking website updates, automated and simplified
Obzrv.it - Obzrv.it is a universal web monitoring service.
IP Guide - Look up IP addresses, networks, and ASNs
WebARX - Website Protection, Managed Website Security & Website Monitoring
Visualping - Visualping is the easiest to use website checker, webpage change monitoring, website change detector and website change alert software of the web. Read more about Visualping.
IP Lookup by Wafris - Bot, Reputation and Live Probe of IP addresses for threats.