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.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
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.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
WebSite-Watcher - WebSite-Watcher detects website updates and highlights all changes in the text. WebSite-Watcher monitors web pages, password protected pages, disucssion forums and much more.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.