OBS Studio

OBS (Open Broadcaster Software) - Free and open source software for live streaming and screen recording, Advanced Scene Switcher.
https://github.com/jp9000/obs-studio

OBS Classic

This is the repository for OBS, an open source live streaming / recording app for Windows, Simple scene switcher.
https://github.com/jp9000/OBS

Screen capture recorder to video windows free

A free open source windows "screen capture" device and recorder (also allows VLC/ffmpeg and others to capture/stream desktop/audio)
https://github.com/rdp/screen-capture-recorder-to-video-windows-free