MSI Afterburner - Tool to manage video cards. Shows video card stats (temp, GPU usage, etc.).
SimpleScreenRecorder - SimpleScreenRecorder is a Linux screen recorder that supports X11 and OpenGL.
ASUS GPU Tweak - ASUS GPU Tweak fully implements TechPowerUp’s GPU-Z analysis and monitoring features.
Camtasia - Camtasia 2018 makes it easy to record your screen and create polished, professional-looking videos.
Guru3D - Guru of 3D: PC Hardware Reviews and tests
OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.