FreshRSS is a self-hosted RSS feed aggregator like Leed or Kriss Feed.
It is lightweight, easy to work with, powerful, and customizable.
It is a multi-user application with an anonymous reading mode. It supports custom tags. There is an API for (mobile) clients, and a Command-Line Interface.
Github: https://github.com/FreshRSS/FreshRSS
Website: https://freshrss.org