The combination "IPTV restream GitHub" is a common search among hobbyists and self-hosters. It usually refers to open-source tools that allow you to take an existing IPTV stream (e.g., from a subscription, a local tuner, or a public URL) and rebroadcast it to multiple devices within your home network or to a few external players.
Have a favorite restreaming tool? Share it in the comments. iptv restream github