Website: https://freshrss.org/
Source Code: https://github.com/FreshRSS/FreshRSS
Donate: https://liberapay.com/FreshRSS
"FreshRSS is a self-hosted RSS feed aggregator. 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."