Right now just a subreddit r/nicheforums and a Matrix server. The main gateway will be a custom forum that organizes conversations by topics (not subforums), allowing threads to belong to multiple topics. The forum will intentionally remain small and does not aim to grow as large as Reddit. This is a very early announcement to advertise for interested users. Please join the Matrix server for now, as it’s the primary discussion hub.

https://matrix.to/#/#niche-forums:matrix.org

The project has a very slow development rate. Right now I'm in the brainstorming phase and nothing will materialize for a couple of years.