Website: https://joinmastodon.org/
Source Code: https://github.com/mastodon/mastodon
Donate: https://www.patreon.com/mastodon, https://opencollective.com/mastodon, https://sponsor.joinmastodon.org/
ΒΆ Description
"Mastodon is free and open-source software for running self-hosted social networking services. It has microblogging features similar to Twitter, which are offered by a large number of independently run nodes, known as instances, each with its own code of conduct, terms of service, privacy policy, privacy options, and content moderation policies."