Here are some readers.
0] https://github.com/GetStream/Winds
1] https://github.com/FreshRSS/FreshRSS
2] https://github.com/feedbin/feedbin
3] https://github.com/yang991178/fluent-reader
If you like something closed source, try feedly.
Reddit provides rss for now. For sources that don't, you can use rss.app or similar.
https://www.reddit.com/wiki/rss
One more useful thing some readers provide is an email address that you can use for subscribing to newsletters.