I like the interface of https://politepol.com/en/ and the free tier gets the job done for me. Plus you learn a little bit about scraping in the process. Source: 12 months ago

Politepol - https://politepol.com/en/ does a decent job with 5 feeds for free. Source: about 1 year ago

Some readers have such option build-in (e.g. FreshRSS). There are also services like: https://createfeed.fivefilters.org/ https://feed43.com/ https://politepol.com/en/. - Source: Hacker News / over 1 year ago

Something like this: https://politepol.com/en/. If it's just text, you can use the free version. Source: almost 2 years ago

Use https://politepol.com/en/ to generate RSS feed from https://arxiv.org/list/q-fin/new and use https://ifttt.com/applets/Ha9qPKXd-post-rss-items-to-reddit to post it to Reddit. Source: about 2 years ago

I strongly recommend adding a schema validator to anything that generates XML. ATOM¹ has a nice schema available² that you can use at the end to check the whole thing (I use xmllint³, since it is in a lot of package repositories). Another nice thing about ATOM compared to RSS is that it has the xml:base attribute, which means you do not need to rewrite relative URLs into absolute ones. You can use recode's⁴... - Source: Hacker News / about 3 years ago

There is also pup. Or if you want to go with a lot more options with xmllint. Of if you want just to render the html in your terminal. Source: about 3 years ago