Free and open source software for video recording and live streaming.
Download and start streaming quickly and easily on Windows, Mac or Linux.
High performance real time video/audio capturing and mixing. Create scenes made up of multiple sources including window captures, images, text, browser windows, webcams, capture cards and more
Set up an unlimited number of scenes you can switch between seamlessly via custom transitions.
OBS supports all your favorite streaming platforms and more.

Back-up Link:  Obs Studio