Kbin is a Reddit-style link aggregator and discussion platform for the Fediverse. As it communicates using the ActivityPub protocol, Kbin servers can communicate with other Fediverse server types such as Mastodon etc.
It’s still in early beta testing, but already has servers up and running you can try out. Find out more from the official Kbin site ⧉ or try out its flagship server at kbin.social ⧉.