reiver, 
The Threadiverse already has Lemmy & Kbin.
But I think many people aren't aware of Prismo.
https://gitlab.com/prismosuite/prismo
Prismo is a link-sharing sharing and aggregation platform similar to Reddit, Lobste.rs, and Hacker News.
I.e., similar to both Lemmy & Kbin.
Its development started back in June 2018. But it isn't ready for production yet. It also looks like its development stalled back in May 2019.