Self Hosting an RSS feed for news/media/etc? - eviltoast

Heyas, wondering if there’s an open sourced piece of software or the like, that could scrape media platforms for a specific topic. Platforms like YT, X, Lemmy, News Media, etc., perhaps using RSS? But, a program I can host on my server, that only I have access too, via webpage, CLI, whatever…

Thanks for any info…