OBS Studio is free and open source software for video recording and live streaming, featuring real time video/audio capturing and mixing. Users can create scenes made up of multiple sources including window captures, images, text, browser windows, webcams, and capture cards.
From simple streaming to bigger events, OBS has been able to handle all of it with full confidence from us. Have never questioned if it was going to be unreliable in a specific situation, even with minimal training. Software identified the external input source easily and had no issues setting that up (Blackmagic Mini Recorder), and great for pulling in separate audio from the computer input.
Very usable because it is free and has had a lot of people helping to suggest improvements and sponsors have allowed the product to grow in sophistication and suitability across a variety of situations and use needs. It is very logical to use once you get started, although the dashboard can seem intimidating at first.
For a free product, a range of support is available. There are plenty of ways to find out answers to questions, because there are probably thousands of people using the product who are willing to share what they have learned. It usually works as designed, so needs for support are limited.
Only one reason which is that OBS studio is free and open source and we had team members capable of using it effectively. Other softwares have great prebuilt features which make it super easy to go live for small streams and individual streamers.