Port Monitor

Port Monitor is an easy and online tool that does website and server monitoring for you 24/7 every 60 seconds and sends you or your co-workers instant email/push notifications when something goes wrong.

Freemium Web

StatusCake

StatusCake enables the visitor to track unlimited websites for free and get alerts when the site is down or having trouble. StatusCake also tracks performance over time so a webmaster can detect issues because they arise.

Freemium Web

Pingoscope

Pingoscope will carefully monitor your website and alert you instantly if it goes down.

Freemium Web

Binary Canary

Website monitoring service that offers a comprehensive free plan with: * escalation levels (if a first-responder contact doesn't acknowledge the downtime, another...

Commercial

Uptime Web

UpTimeWeb is a simple, clean, easy to use powerful monitoring system without the “bloat”, that is easy to use thanks to our no-nonsense User Interface. The system itself...

Free Personal Mac OS X Windows Linux Android Web

Runtime

Website monitoring (HTTP HEAD/GET), service monitoring (TCP socket test), e-mail and URL alerts.

Free Open Source Web