Camtasia - Camtasia 2018 makes it easy to record your screen and create polished, professional-looking videos.
Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
SimpleScreenRecorder - SimpleScreenRecorder is a Linux screen recorder that supports X11 and OpenGL.
JACK Audio Connection Kit - JACK Audio Connection Kit|Home