If you mean other federated FOSS alternatives to mainstream social media, I gave a brief overview in another comment [0]. You can get a bird's-eye view at https

If you mean other federated FOSS alternatives to mainstream social media, I gave a brief overview in another comment [0]. You can get a bird's-eye view at https://fediverse.party/ https://fediverse.party/ or a more detailed look at https://fediverse.network/ https://fediverse.network/. Many of these services use the Activitypub protocol to allow them to inter-operate. Two examples with excellent interop are Pleroma and Mastodon; as a Pleroma user, I can't even tell the difference between a Pleroma and Mastodon user until I open another user's profile on their own instance. [0]: https://news.ycombinator.com/item?id=24911239 https://news.ycombinator.com/item?id=24911239