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obsninja
VDO.Ninja is a powerful tool that lets you bring remote video feeds into OBS or other studio software via WebRTC.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I use OBS and a tool called vdo.ninja to get my guests in to my streams. It gives my great flexibility in terms of controlling video and audio from my guest, that's both for live and recorded uses. Both are free and have amazingly great performance. There's low to no latency.
Open Broadcaster Software. Free open source streaming software thats ubiquitous among streamers and content creators. Easy to learn, difficult to master. Tonnes of tutorials online and a very strong user base.