Monitority - Simple website monitoring service (sms/email alerts)
Backlinks by Neil Patel - A backlinks research tool for competitive intelligence
Suprvise - Know instantly when your sites are down.
Monitoro - Monitor webpages and get fresh data sent to your webhooks.
PingPing - A simple tool to monitor your website and SSL
Backlink Tool - A backlink tool to index your links quickly and freely.