OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
CamStudio - CamStudio is a screen capturing tool that records video from computer screen and save it to system’s storage with AVI extension, which is propped up by most frequent video players and editors.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Free Screen Video Recorder - Free Screen Video Recorder: record video with sound, make screenshots in BMP, JPEG or PNG format.
LightShot - The fastest way to take a customizable screenshot.