Distill Web Monitor - Distill is a web monitoring tool. It can monitor RSS feeds, a webpage or a part of webpage. Alerts in the form of pop-up, audio or emails can be received.

Needle X3 - Get alerts when a monitored site adds specific phrases

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.

PingPing - A simple tool to monitor your website and SSL

Wachete - Track web page changes and get notified. Free Sign-up. Have all data in one place

Octohook - Helps you visualise, debug and redistribute your webhooks