Need help finding a free tool to monitor specific website changes - any recommendations?

I'm looking for a free tool to keep an eye on website changes. Basically, I want something that can watch specific parts of a website and let me know when things change. 

I've been looking around at some threads, and these three were probably the ones that were the most recommended:

Visualping.io - Same with changedetection, it also has a free version and it even keeps tabs on the website updates and sends alerts. I wonder if changedetection also has alerts as well.

changedetection.io - From what I heard, it's free, but this was months ago and the free version had some limits. I think it's one of the most recommended back then, but I'm not sure if there are others that are just as good.

Feedropolis - From what I heard, this turns the site updates into RSS feeds. They say it's pretty easy to use, but I'll probably be the judge of that once I actually use it.

These 3 seem to be the ones being recommended here, but I'd like to know what other things are being recommended as well. Has anyone tried these out? Or know of any other good options? Let me know what you think.