It is written in Python (Flask) with a simple interface.
Licensed under GNU Affero General Public License version 3.
Easy to deploy but you can also use the official instance.
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Oops, I made a mistake. You found the good URL. Thank you for your comment. I just edited the original post to fix the link.
I tested the service with up to 400 users. On my own account I am following 122 feeds (with 285622 articles). But the goal is not necessary to have thousands of users on one instance. (it cost me a bit f money and registration are still free).
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