Venmon - Compact size system resources monitoring utility and multi-ping tool for Windows
Curler by Amixr.IO - Curler by Amixr.IO is a lightweight tool that lets you monitor your website uptime by checking your site once per 10 minutes and let you know if it’s working or not.
Scout - Application Monitoring that finds what you can't see in charts.
Checkmk - Checkmk - the software for effective IT monitoring
Trimgle - Web page and json monitor, get control of information
Wachete - Track web page changes and get notified. Free Sign-up. Have all data in one place