I called this category Resources but it's really Miscellaneous That Doesn't Fit Anywhere Else. Enjoy.

If you have a website that for some odd reason doesn't provide an RSS feed, several 3rd party services will make one for you. Such as:

Feed Creator You have to have a bit of HTML knowledge for this one.

Feed43 is a freemium service with free and reasonably-priced annual plans

Feedity doesn't have a free plan, but claims to have an API for developers

Cloudflipper is a free service that converts your SoundCloud dashboard into an RSS feed.

TwitRSS is a free service that converts your Twitter stream into an RSS feed.

There's also a Google Script that also converts your Twitter stream into RSS.

If you can self-host PHP scripts (which is almost everybody) you can get RSS-Bridge and covert any number of social media streams into RSS feeds.

When all's said and done, you need to check your RSS feed to see if it's well-formed, and has all the elements in the right places. My favorite place for that is FeedValidator.org. It's free and easy to use. You just put in the url of your RSS feed and it either give you an OK, or tells you what's wrong with it. It hasn't been updated since 2009, but not much has changed in the standards since then. I hightly recommend it.