OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Screencast-O-Matic - Free version Records up to 15 minutes, premium is $15/year.
Shutter - Shutter is a feature-rich screenshot program.
XSplit - Live stream and record your content with ease & share it to streaming services like Twitch, YouTube, Facebook, Mixer, etc. Start your broadcast today.
Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image