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What's the software they use for their livestreams?
(discuss.tchncs.de)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Not sure what they use (you could ask one of them.) Bue we've used OBS Ninja for similar things. As far as I remember it works well, has acceptable latency and everything is open source.
Edit: Obviously you have to put in some effort to configure OBS to your liking, make appealing slides etc.
That is absolutely amazing