You should definitely use RoboStreamer (https://robostreamer.com/) if you are going to be broadcasting your game during a festival like Steam Next Fest. RoboStreamer is made by a guy named Chris and it's fairly easy to setup. Chris is also very helpful should you run into any problems. On his site he has a couple of great guides, which I will link to here as well. Source: over 1 year ago

I know http://singular.live is great for this. Run from anywhere. Source: about 2 years ago

There are several newer platforms that give you a lot of the features and functionality that those systems offer. The best one I have used it singular.live They have pre-built templates you can use or you can build your own graphics from scratch in their composer. You can sign up and use Singular for free but the output has a watermark on it. A Pro account is $100 a month. Source: about 2 years ago

Lexogrine is just for in-game stuff, outside cs graphics probably is done with tools such as singular.live, flowics, Titler Live, or something similar. Source: about 2 years ago

You need (preferably) a third party program for that. They will give you an output url that you just paste as a browser source into OBS. So you don't control the stats from OBS itself, but from a separate website/program. For example, you can check out http://singular.live. Source: over 2 years ago