There are a couple in current development you can contribute to. Look at Lemmy and Lobste.rs. There as Prismo too, but it's been discontinued (but you might be able to pick up and fork the code).
Cool thanks. I might have to start from scratch just because of the underlying mechanisms that I'd want in it. The premise is to use microtransactions for posting/comments, mixed with a bit of the patreon model, to reward good posts and have a barrier to entry for reposts/trolling.
Sounds like a great way to discourage people from saying anything they think won't be popular with the echo chamber. Rewarding people with upvotes/reddit gold is bad enough, rewarding them with real money will make it much worse.
May I suggest a way to weigh votes. Either "count voters who vote like the people I follow" or "elect seed voters for a community, and extrapolate votes based the seeders and people who vote like the seeders."
It would be cool to be able to sort a comment section, with a dropdown, between "best", "like people I follow", "like /r/askhistorian seeds", "like /r/askscience seeds"