Catch: Broadcatching made easy.
Runs in the menubar, and won't slow your Mac down one bit. Notification Center notifications are optional.
Catch accepts any number of RSS and Atom feeds, with special support for ShowRSS feeds; their contents will be downloaded with your favorite BitTorrent client or with a custom script. You can configure Catch to be active only at specific hours of the day.
A true macOS app that supports Big Sur, Dark Mode, Apple Silicon, you name it.
Speaks 11 languages, and you can contribute easily.
Catch is free and open-source.