OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
Twitch - Twitch is one of the most prominent streaming services around, serving as a platform primarily for video game and pop culture streamers.
ffscreencast - Command-line screen-recording using ffmpeg
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
Streamlabs - All-in-one live streaming software
YouNow - YouNow is a free social networking app that allows you to connect with other users via live video broadcast.