Based in this question, thought this should be it's own thread so as not to take it off topic
https://www.gpwa.org/forum/where-get...tml#post995233
There are a number of ways to discover broken links, having nothing to do with whether the site is popular or not.
What comes to mind as the 2 very popular choices are Screaming Frog and Xenu. The reports you can get from either of these will help you find broken links, missing images, pages that have issues with titles or image alt tags and many more things.
Main drawback with screaming frog is that it is limited to a total of 500 links on the free version, but if you like the software it is not hugely expensive.
Xenu is free without limitation, but it is a bit more old school in it's report layouts etc.
Both of these are very thorough and it just takes a bit if study when first learning how to use them to get the best advantage out of their use.
I am sure there are other things to use, some that may have additional functions.
Rick
Universal4