The open source nature of OBS means that on top of the oodles of features and settings it natively has, there is an ever-expanding library of mods out there. There are tons of different settings and options that can allow you to change just about anything you could want to ranging from the obvious like stream quality all the way to the incredibly specific such as volume adjustment by channel. It's simple to install and can almost immediately be used to stream on twitch or be configured to save recordings to your local storage.
Overall Opinion: Open Broadcast Software, or OBS, is a very thoroughly designed free and open source screen capturing and streaming software.
