https://news.ycombinator.com/item?id=42685138 https://news.ycombinator.com/item?id=42685138 is the one I always post in any mention if Discord or Slack because

https://news.ycombinator.com/item?id=42685138 https://news.ycombinator.com/item?id=42685138 is the one I always post in any mention if Discord or Slack because they are both walled gardens In your specific case, you may have to self-host or pay because I don't believe your project would qualify under their open source hosting offering but it wouldn't hurt to ask