Cheese - Cheese uses your webcam to take photos and videos, applies fancy special effects and lets you share...
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Webcamoid - Webcamoid is a full featured webcam capture application.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Kamoso - Kamoso is a webcam recorder from KDE community.
LightShot - The fastest way to take a customizable screenshot.