Uptime monitoring: read monitors, incidents and response times; create and change monitors.
Free
One server, in analytics & monitoring. Uptime monitoring: read monitors, incidents and response times; create and change monitors.
Analytics & Monitoring
Uptime monitoring: read monitors, incidents and response times; create and change monitors.
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.