I developed a small tool to find RSS feeds for websites. You can try it out here:
https://lighthouseapp.io/tools/feed-finderIn >90% of cases the standard way of checking meta tags is enough to find the feeds. But my goal for this tool is that it finds feeds regardless if they're linked somewhere or not. That if this feed finder doesn't find a feed, no feed exists.
It's a big goal and admittedly not there yet, but it does a few things that are a step in that direction.
* Checks meta tags of parent pages (sometimes the article itself doesn't have the meta tag, but the main blog page does)
* Checks common suffixes like /rss, /index.xml and many others (sometimes the feed exists but isn't linked)
* Checks the sitemap
* Checks all links on the page
* Checks 3rd party feeds (OpenRSS for now, when I find more such repositories I'll add them too)
There are a couple of additional ideas I have, like checking search engines and crawling the entire domain (highly inefficient, but possible).
Would love if you could try it, and even more if you post sites where it doesn't work.
If you maintain any website with a news feed, go right now and check that you have this in your <head>:
(Also note whether and where you need to use application/rss+xml, application/atom+xml, or application/json.)