Owncast (10k GH stars)

It's the most popular self hosted RTMP streaming server with chat integrated. You set it up to host your own stream with chat.

Different chat protocols are supported, including Mastodon, but not Nostr.

A Nostr integration would

1. Create a Nostr kind 30311 event on live stream starts, and update it as the stream runs/ends

2. Pick up kind 1311 events for the chat feed

It would be a very good trojan horse to Nostr. The moment existing Owncast get defaulted into publishing 30311's, Zap Stream etc will be full of content.