Kbin is a modular, decentralized content aggregator and microblogging platform running on the Fediverse network. It can communicate with many other ActivityPub services, including Mastodon, Lemmy, Pleroma, Peertube. The initiative aims to promote a free and open internet.
This is a very early beta version, and a lot of features are currently broken or in active development, such as federation.
https://symfony.com/doc/6.1/reference/requirements.html