WebChangeMonitor is an Open Source app that allows you to monitor multiple web pages tracking changes based on webpage content. 64-Bit available.
WebChangeMonitor permits you to monitor several protocols, including HTTP and HTTPS. It also lets you view and record any webpage content differences. It is essentially a hybrid RSS reader with some options not offered by strictly a reader, like displaying the GUID for the web page.
Set up for WebChangeMonitor is simple; add your target page information; if there is an issue, the app will let you know immediately. The UI is equally simple with a minimalistic display. Still, it does include several configuration settings to fine-tune the output to your needs, like check intervals, comparison of web content against saved data on your machine, and more.